こっすい

devious; cunning

Word type: I-adjectives

Standard: ずるがしこい

Standard kanji: 狡賢い

Example:

A: あの子、いっつもうちの宿題うつして、自分でいっこもせえへんねん。
B: こっすいなあ。

A: She always copies my homework--I don't think she's ever done any by herself.
B: Quite a cheater, huh?

Commentary:

This word has a stronger feeling than こすい.

こっすい and すっこい have the same meaning.