noun ·Uncommon ·Advanced level

Definitions

Noun

1. 1
   An excessive or unwarranted degree of confidence. uncountable, usually

   "My case is, as I have told you, almost complete; but we must not err on the side of over-confidence."

2. 2
   total certainty or greater certainty than circumstances warrant wordnet

Synonyms

All synonyms

certitudearroganceassuranceassurednessbeliefbrashness

Example

More examples

"You should beware of overconfidence."

Etymology

From over- + confidence.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.