be as honest as the day is long

be as honest as the day is long

To be very truthful and reliable. Tom is as honest as the day is long—if he promised to help you move, then he'll be here. Kate would never cheat on an exam—she's as honest as the day is long.
See also: honest, long
Farlex Dictionary of Idioms.
See also:
  • (as) honest as the day is long
  • honest as the day is long
  • as good as (one's) word
  • as good as word
  • be as good as (one's) word
  • be as good as your word
  • speaking candidly
  • to be truthful