Main Entry: cock·sure

Pronunciation: \ˈkäk-ˈshu̇r\

Function: adjective

Etymology: probably from ¹cock + sure

Date: 1608

1 : feeling perfect assurance sometimes on inadequate grounds
2 : marked by overconfidence or presumptuousness : cocky

synonyms see sure

— cock·sure·ly adverb

— cock·sure·ness noun