The person who declares his victory without assessing his capabilities or the final result or situations.
Congress party in India was over-confident of its winning in Gujarat but Mr. Narendra Modi won after so much of critisism.
by deepa January 30, 2008
1 more definition
Arrogant, presumptuous, assuming.
It's good to have a healthy self esteem, however being overconfident can wind you up in a corner.
by donyouknowtit January 13, 2010