The Oxford Thesaurus An A-Z Dictionary of Synonyms - gall° n.

1) bitterness, acerbity, acrimony, harshness, vitriol, asperity, bile, spleen, causticness or causticity, bite, mordacity or mordaciousness, sharpness, rancidness or rancidity; venom, poison, rancour: Once more he experienced the gall of disappointment. 2) impudence, insolence, impertinence, audacity, brashness, brazenness, sauciness, effrontery, temerity, overconfidence, front, Colloq brass, nerve, guts, cheek, lip, crust, sauce, US and Canadian chutzpah, moxie; Slang balls: One student had the gall to suggest that he would be a better teacher than I am.