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鬼 oni
Turns any word up to eleven.
What does oni mean?
The prefix goes in front of an adjective and maxes it out. Demon-cold, demon-busy, demon-cute.
Example
今日は鬼寒い。
It's demon-cold today.
Vibe
Who you can say this to, and how it lands.
Friends only Casual. Natural with friends, out of place at work or with strangers.
The story behind oni
The oni of folklore is a horned creature with a club, more ogre than devil, turning up at festivals where someone in a mask gets beans thrown at them. As a prefix it lost the horns and kept the excess: attach it to an adjective and the adjective goes to maximum.
Oni cold, oni busy, oni cute, oni delicious. It sits in a long line of intensifiers that each sound dated after a decade, alongside older ones from earlier youth slang and regional favourites that never quite went national. Using it marks your speech as casual and slightly rough, in the friendly way rather than the intimidating one.
Get oni in your pocket
鬼 is one of 308 words in YABAI, a Japanese culture snack for Android. Every word comes with its meaning, an example sentence, a vibe check and a story like the one above — in 13 languages, read aloud by your device. Paid app: no ads, no sign-up, no subscription.
