cocksure
cock·sure
adjective
1.
marked by excessive confidence
- “an arrogant and cocksure materialist”
- “so overconfident and impudent as to speak to the queen”
- “the less he knows the more positive he gets”
Origin
Probably from cock (“rooster”) + sure, early 16th c.
Related words
Word family
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.