やばい (yabai) can mean “dangerous,” “awful,” or “amazing.” It is highly casual and often expresses strong emotion. やばい状況 points to trouble, while やばいほどおいしい can praise food intensely. Tone and context decide whether the reaction is positive or negative.
also yabee / yaba / yabakatta / yabakunai
dangerous · awful · incredible · amazing
Sentences
やばい · the original sense
plain、。
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やばい
やばい
this is bad
い-adjective · thrown out alone, it is a whole sentence
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遅刻
ちこく ［0］
being late
noun ＋ する · 遅 late ＋ 刻 hour
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する
する
will do; is going to happen
irregular verb · plain present pointing at the near future
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This is bad — we're going to be late.
やばいくらい · forcing the praise reading
plain、。
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この
この
this
determiner · attaches straight to a noun
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ラーメン
ラーメン ［1］
ramen
noun · katakana because it came in from Chinese
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やばいくらい
やばいくらい
to an absurd degree
やばい ＋ くらい · pins the intensity to the adjective coming next
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うまい
うまい
delicious
い-adjective · blunter and more male-coded than おいしい
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This ramen is insanely good.
やばい ＋ 名詞 · the old sense wins
plain。
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それ
それ
that one
pronoun · the thing you just mentioned
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は
は
as for — the topic
particle · written は, read わ
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やばい
やばい
alarming; not okay
い-adjective in front of a noun · here it means trouble, not praise
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金額
きんがく ［0］
sum of money
noun · 金 money ＋ 額 amount
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だ
だ
is
plain copula · the casual counterpart of です
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よ
よ
I'm telling you
sentence particle · flags information the listener lacks
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That's a scary amount of money.
やばくない? · the tag question
plain、？
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この
この
this
determiner · points at what is in front of you both
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景色
けしき ［1］
view; scenery
noun · read けしき, not けいしょく
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やばくない
やばくない
isn't it incredible?
negative of やばい as a tag question · almost always praise
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Isn't this view unbelievable?
やばかった · past
plain past、。
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昨日
きのう ［2］
yesterday
noun used adverbially · no particle needed
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の
の
links noun to noun
particle · A の B = B belonging to A
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テスト
テスト ［1］
test; exam
noun · 試験 is the formal word for the same thing
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まじ
まじ
seriously; for real
casual adverb · from 真面目, and just as informal as やばい
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で
で
marks the manner
particle · まじで is a fixed pair meaning 'genuinely'
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やばかった
やばかった
was brutal
past of やばい · い-adjectives never take でした
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Yesterday's test was brutal.
やばい about a person
plain。
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あの
あの
that (we both know who)
determiner · used for someone outside the conversation
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人
ひと ［0］
person
noun · 人 read ひと when it stands alone
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は
は
as for — the topic
particle · written は, read わ
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ちょっと
ちょっと
a bit
adverb · softening the blow of what comes next
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やばい
やばい
unstable; trouble
い-adjective about a person · this reading is never a compliment
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That guy is a bit much.
Forms
Noun ＋ は/が＋やばい
この状況はやばい. Often with no subject at all — a bare やばい thrown at the room is a complete sentence and everybody knows what it refers to.
やばい＋Noun
やばい人, やばい金額, やばい店. In front of a noun the older sense — dangerous, best avoided — is much more likely than the praise sense.
やば＋かった / くて / くない
Past やばかった, て-form やばくて, negative やばくない — which in practice gets used as a question meaning the opposite: isn't it amazing?
やばいくらい＋Adjective / Verb
やばいくらいうまい, absurdly good. Pinning it to another adjective is how speakers force the praise reading when a bare やばい would be ambiguous.
Meaning
The old sense is the literal one. やばい is recorded in Edo-period criminal slang for a situation about to go wrong — a lookout's word. Through the twentieth century it stayed close to that: dangerous, dodgy, about to cost you. やばい人 and やばい店 still mean exactly that today, and nobody reads them as praise.
The flip is about intensity, not about good and bad. What the word really reports is that something has exceeded your capacity to deal with it calmly. A tax bill does that. So does a dessert. Once younger speakers started using it for the second kind in the 1990s, the word stopped carrying a direction at all — it carries a magnitude, and the listener supplies the sign.
Tone and grammar do the disambiguating. Falling and sharp is trouble; drawn out and rising is praise. やばくない? as a question is nearly always admiring. やばいくらい〜 forces the good reading by attaching to something already positive. And in front of a noun, the old sense wins by default.
It is unsayable at work, and this matters more than it sounds. やばい is register-marked as young and casual, so using it with a manager or a client reads roughly like saying “that's sick” in a job interview. The safe substitutes are まずい for the bad sense, 危険 for actual danger, and すごい or 素晴らしい for the good one. Learners hear やばい constantly and conclude it is neutral. It is not.
Inside the word
The likeliest ancestor is 厄場 — an Edo-period slang term for a jail or a guardhouse, so やばい is roughly “jail-ish”, the lookout's warning that this is about to go wrong. A competing account traces it to 彌危ない, extremely dangerous. Either way the root sense is a threat, not a thrill.
There is no settled kanji, and that is the point: the word lives in speech. You will see やばい, ヤバい and ヤバイ, and the katakana forms carry a shade more emphasis. Writers pick the script the way English writers pick italics.
The praise sense is documented spreading through Japanese teenagers in the 1990s and normalised by the 2000s. It is the same move English made with “wicked”, “sick” and “insane”: a word for too-much-to-handle stops caring which direction the too-much runs in. Older speakers still hear only the original.
Watch out
It is marked as young and casual, and no amount of です repairs that — やばいです is worse, not better, because it advertises that you know the register is off. Say まずいです for a problem and 素晴らしい for praise.
やばい店 is a place with something wrong with it, not a great find. Attributive position defaults to the old sense, so if you mean the praise reading you have to say it another way — やばいくらいうまい店.
It is an い-adjective, so the word inflects and です does not: past is やばかった, polite past やばかったです. The same rule that gives you 高かったです, not 高いでした.
Also asked
Both, and the word itself does not decide. What it reports is intensity — something has gone past what you can react to calmly. Falling, sharp intonation reads as trouble; drawn out or rising reads as praise. In front of a noun, assume trouble.
No. It is register-marked as young casual speech, and adding です does not fix it. Use まずい or 危険 for the bad sense and すごい or 素晴らしい for the good one.
The contracted form — やばい with the あい collapsed to a long え, the same change that turns すごい into すげー. It is rough and male-coded. Understanding it is useful; producing it will read as an impression of an anime character unless your Japanese is already fluent.
Because as a question it is not really a negative — it is an invitation to agree, like English “isn't that insane?”. Said flat as a statement, やばくない genuinely means it is fine. The rising intonation is doing all the work.
すごい is intensity you can say to anybody; やばい is intensity plus a claim that you are struggling to handle it, in slang register. すごい also swings both ways — すごい雨 is not a compliment — but it is safe in situations where やばい is not.
Not in practice. 厄い and 危ばい turn up in etymological notes, but real writing uses kana: やばい plainly, ヤバい or ヤバイ for extra punch.
References
Kotobank: やばい — Defines danger and records the newer strongly positive colloquial sense.
Nearby
the respectable twin — same good-and-bad flip, safe in any room
微妙bimyouthe same trick in the other direction — a hedge that means no
面倒くさいmendokusaithe other casual い-adjective you will hear a hundred times a day
恥ずかしいhazukashiianother feeling word that does not map onto one English adjective
がち vs っぽい vs 気味gachi · ppoi · gimiやばいっぽい — hedging a word that is already an exaggeration
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