Some synonyms for the phrase "cavil at" include: nitpick, criticize, find fault with, knit pick, quibble, argue, dispute, object to, pick holes in, scrutinize, rebuke, reprimand, censure, condemn, blame, complain, fault-find, carp, and grumble. All these synonyms carry the same negative connotation as caviling at something or someone displays a lack of acceptance or satisfaction with something. Therefore, it is essential to keep in mind that these synonyms convey a critical or negative attitude that can affect the person or object being criticized.