dirtily, dishonestly, unfairly
Он сыграл нечисто.
He played unfairly.
Он сразу расчухал, что дело нечисто.
He immediately realized that something was fishy.
Что-то бы́ло нечисто.
Something wasn't kosher.
Он всегда ведёт дела нечисто.
He always conducts business dishonestly.
Судья сыграл эту игру нечисто.
The referee played unfairly in that game.
WiktionaryPONSbab.laReverso