gentle as a lamb

(as) gentle as a lamb

Pleasant, caring, and calm. My rambunctious son is as gentle as a lamb with our cat. Mr. Stewart may seem crotchety, but he's as gentle as a lamb—he's actually helped me carry my groceries many times.
See also: gentle, lamb
Farlex Dictionary of Idioms.

*gentle as a lamb

Cliché [of someone] very gentle. (*Also: as ~.) Don't be afraid of Mr. Schaeffer. He may look fierce, but he's as gentle as a lamb. Lisa was gentle as a lamb when dealing with children.
See also: gentle, lamb
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

gentle as a lamb

If someone is as gentle as a lamb, they are very kind and never become angry or aggressive. Brian was as gentle as a lamb and wouldn't hurt anyone. Verdy was as gentle as a lamb off the field but a raging lion on it.
See also: gentle, lamb
Collins COBUILD Idioms Dictionary, 3rd ed.
See also:
  • (as) gentle as a lamb
  • be as gentle as a lamb
  • gentle
  • be as nice as pie
  • lamb
  • be going great guns
  • be whistling in the dark
  • all wound up
  • be (as) green as a gooseberry
  • be a moot point/question
References in periodicals archive
But owners Julie and Ray Woods, of Boston, Lincolnshire, say their 19-stone 10lb pet is as gentle as a lamb - even if they admit it's him who takes them for a walk.
MEET SAMSON..DOG OF BIBLICAL PROPORTIONS; 19st and 6ft 5in but pet's bark is worse than bite
Owners Julie and Ray Woods insist the Great Dane and Newfoundland cross, pictured here with their four-year-old grand-daughter Niami Horrocks, is as gentle as a lamb.
BRITAIN'S BIGGEST DOG; The World Today
But owner Julie Woods, 54, of Boston, Lincs, insists he is "gentle as a lamb".
PUPPY LOVE