Englishcarp
verb
broadcasters always found something to carp about, even after an undoubted success:
complain, cavil, grumble, moan, grouse, grouch, whine, bleat, quibble, niggle, nag;
find fault with, criticize, pick on, censure, denounce, condemn, decry, disparage;
Northern English mither, twine;
informal gripe, beef, bellyache, bitch, nitpick, pick holes, split hairs, sound off, kick up a fuss, knock;
British, informal whinge, chunter, create, be on at someone;
North American, informal kvetch.
▷antonyms praise.