grumbler n a person given to excessive complaints and crying and whining Usage(s) This question, as always in Berlin, stopped the grumbler in his tracks. No grumbler is Bomb Boy Michael Frolenko. Grumbles can be handled in two ways; putting a hand over the grumbler's mouth, or trying to remove the cause of the grumbling. Synonym(s) whiner complainer moaner sniveller crybaby bellyacher squawker