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