Entry 1 sense Webster, 1913 Overconfidence /ōvˌ-ẽrk-än'-fĭd-əns/ · O·ver·con·fi·dence · IPA /oʊvɚˈkɑnfɪdənts/ 01 n. Excessive confidence; too great reliance or trust. 1. Excessive confidence; too great reliance or trust.