also: こすい
i-adjective
Describes a person or action that is crafty, sneaky, or self-serving in a way that feels unfair. Common in everyday speech.
ずるいよ！一人だけ先に食べるなんて。
That's not fair! Eating ahead by yourself.
彼はずるい手を使って勝った。
He won using a sneaky trick.
i-adjective
Only with reading こすい
Rare reading こすい used mainly in older or dialectal speech for a stingy, tight-fisted person. Not common in modern standard Japanese.
あの人はこすいから、絶対におごってくれない。
That person is so stingy, they'd never treat you.