noun
bitterness, indignation, pique, offense, displeasure, rancor, animus, antagonism, hurt, perturbation, acrimony, acerbity, exacerbation, umbrage, grudge, envy, jealousy, spite, outrage, hostility, ill will, hard feelings, anger, ire, malice, vexation, exasperation, choler, annoyance, irritation, rankling, discontent, gall, bile; see also anger, hate.
Antonyms friendship, contentment, delight. See syn. study at offense.offense.