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