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