be as nice as pie

be as nice as pie

slang To be surprisingly or unexpectedly pleasant. Mr. Stewart may seem crotchety, but actually he's as nice as pie—he's helped me carry my groceries many times.
See also: nice, pie
Farlex Dictionary of Idioms.
See also:
  • nice as pie
  • (as) gentle as a lamb
  • be as gentle as a lamb
  • gentle
  • gentle as a lamb
  • if (one) is a day
  • if he is a day
  • if he's, she's, etc. a day
  • be going great guns
  • French leave