complain Play verbExpress dissatisfaction or annoyance about something. SYNONYMS be on at someonebeefbellyachebewailbleatcarpcavilchirpchuntercreatecribcriticizefind fault withgo on aboutgripegrizzlegrouchgrousegrumbleinveigh againstkick up a fusskick up a stinkkvetchlamentlodge a complaintmake a complaintmake a fussmithermoannatterobject toopposepick holes inplain overprotestrail atrun downsound offspeak out againsttwinewhinewhinge