a wolf in sheep's clothing

US /ə wʊlf ɪn ʃiːps ˈkloʊðɪŋ/
UK /ə wʊlf ɪn ʃiːps ˈkloʊðɪŋ/
"a wolf in sheep's clothing" picture
1.

волк в овечьей шкуре

a person who appears friendly or harmless but is actually dangerous or malicious

:
Be careful of him; he's a wolf in sheep's clothing.
Будь осторожен с ним; он волк в овечьей шкуре.
The new manager seemed nice at first, but he turned out to be a wolf in sheep's clothing.
Новый менеджер сначала казался милым, но оказался волком в овечьей шкуре.