1. effrontery Assurance may have the good sense of a high, sustained confidence and trust; as, the saint's assurance of heaven. Confidence is founded upon reasons; assurance is largely a matter of feel Synonyms: assurance, arrogance, boldness, impudence, self-confidence, assertion, confidence, presumption, self-reliance, assumption, effrontery, self-assertion, trust Antonyms: bashfulness, consternation, distrust, hesitancy, shyness, confusion, dismay, doubt, misgiving, timidity
Synonyms for effrontery 
