au·dac·i·ty /ôˈdasədē/ rude or disrespectful behavior; impudence. "she had the audacity to pick up the receiver and ask me to hang up" synonyms: impudence, impertinence, insolence, presumption, cheek, bad manners, effrontery, nerve, gall, defiance, temerity; More all rights reserved

a missed/lost opportunity (a chance that you did not use) all rights reserved