デカい
Meaning: Huge, massive, or enormous — a casual, emphatic way to say something is really big.
デカい is the go-to casual word for 'huge' in spoken Japanese, replacing the more neutral 大きい (ōkii) when you want to emphasise just how big something is. It applies to physical size (デカい建物, a massive building), abstract scale (デカいプロジェクト, a huge project), and figurative expressions (デカい口叩く, to talk big). It has a punchy, emphatic feel that 大きい lacks.
Examples
- あのビルまじでデカくない? 那栋楼也太大了吧?¿Ese edificio no es gigantesco?저 빌딩 진짜 엄청 크지 않아?
- デカい声出すなよ、周りに聞こえるだろ。 别那么大声啊,旁边人都听见了。No grites tanto, que te va a oír todo el mundo.큰 소리 내지 마, 주변에 들리잖아.
- 注文したピザがデカすぎて一人じゃ食べきれない。 点的披萨大到一个人根本吃不完。La pizza que pedí era tan enorme que no me la pude comer yo solo.주문한 피자가 너무 커서 혼자 다 못 먹겠어.
Pronunciation
/de.ka.i/
Usage Guide
Context: friends, casual conversation, reactions
Tone: emphatic, impressed, blunt
✓ Do Say
- この犬デカすぎない? (Isn't this dog insanely huge?)这狗也太大了吧?¿Este perro no es absurdamente enorme?이 개 너무 크지 않아? (이 강아지 엄청나게 크지 않아?)
- デカいことやろうぜ。 (Let's do something big.)干票大的吧。Vamos a hacer algo a lo grande.큰일 한번 해 보자. (뭔가 대단한 일을 해 보자.)
✗ Don't Say
- フォーマルな場では「デカい」より「大きい」や「巨大な」を使う (In formal situations, use 大きい or 巨大な instead of デカい)正式场合应该用'大きい'或'巨大な',而不是'デカい'En situaciones formales, es mejor usar 大きい o 巨大な en lugar de デカい.격식 있는 자리에서는 'デカい'보다 '大きい'나 '巨大な'를 사용한다 (공식적인 상황에서는 大きい나 巨大な를 써야 한다)
Common Mistakes
- Using デカい in written reports or formal presentations — it is a spoken/casual word and should be replaced with 大きい or 巨大 in professional contexts
Origin & History
Of uncertain etymology, possibly related to でかでか (dekadeka, an emphatic onomatopoeia for something standing out due to size). Has been part of colloquial Japanese for centuries, though it was traditionally considered rough or vulgar compared to 大きい.
Cultural Context
Era: Centuries-old colloquial word, always informal
Generation: All ages
Social background: Universal informal
Regional notes: Used across all of Japan. One of the most common casual adjectives in daily conversation.
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