harmless as a dove

Translations
безобидный как голубь
He may look tough, but he's as harmless as a dove.
Он может выглядеть сурово, но он безобидный как голубь.
Definitions
The phrase 'harmless as a dove' refers to someone or something that is innocent, gentle, and non-threatening, often used to describe a person who is peaceful and has no intention of causing harm.