See compunction in Webster's New World Roget's A-Z Thesaurus II
noun
A feeling of regret for one's sins or misdeeds:
contriteness, contrition, penitence, penitency, remorse, remorsefulness, repentance, rue. (Theology) attrition. See regretA feeling of uncertainty about the fitness or correctness of an action:
misgiving, qualm, reservation, scruple. See certain
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