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ヤバかった

was dangerous, was bad, was amazing, was awesome

→ ヤバい
ヤバ dangerous, risky + かった Past tense of an i-adjective
adjective · past Rare #38,462
was dangerous, was bad Colloquial; the exact meaning depends on context.
JA: 昨日の事故はヤバかった。
EN: Yesterday's accident was dangerous.
was amazing, was awesome Colloquial slang, often used positively among younger speakers.
JA: あの映画、ヤバかった！
EN: That movie was amazing!
Forms of ヤバい
ヤバいヤバかった

ヤバかった

That was crazy.

— ANORA アノーラ (2024)

偉い人から重要な仕事を頼まれたおれがいなきゃ君は—ヤバかった

If I hadn’t been here—the guy entrusted with an important job by an important person—you would’ve been in serious trouble.

— フィフス・エレメント (1997)

昨日はヤバかったもんな

Yesterday was wild, huh?

— 君の名は。 (2016)

ヤバかったな

That was crazy.

— マルコムＸ (1992)