<p><strong>Verb (used with object)</strong></p><ul><li>to put into a state of agitated confusion: His constant criticism flustered me.</li><li>Synonyms: disturb, disconcert, bewilder, upset</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>to become agitatedly confused.</li></ul><p><strong>Noun</strong></p><ul><li>nervous excitement or confusion.</li><li>Synonyms: distraction, bewilderment, upset, agitation, turmoil</li></ul>