Complain peevishly is an expression used to describe someone who is complaining in a way that is overly critical and irritable. This expression can be broken down into four crossword solutions: WHINGE (6 letters), WHINE (5 letters), YAMMER (6 letters), and GRUMBLE (7 letters). WHINGE is a British term for complaining in a whiny or petulant manner. WHINE is a verb meaning to make a high-pitched, prolonged sound expressing discontent or pain. YAMMER is to complain or protest noisily or persistently. Finally, GRUMBLE is to complain in a low, surly voice. All of these words are synonyms for the expression 'complain peevishly'.