Usually means: Excessive belief in one's abilities.
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We found 19 dictionaries that define the word overconfidence:

General (16 matching dictionaries)
  1. overconfidence: Merriam-Webster
  2. overconfidence: Oxford Learner's Dictionaries
  3. overconfidence: Collins English Dictionary
  4. overconfidence: Vocabulary.com
  5. Overconfidence, overconfidence: Wordnik
  6. overconfidence: Wiktionary
  7. Overconfidence, overconfidence: Dictionary.com
  8. Overconfidence: Wikipedia, the Free Encyclopedia
  9. Overconfidence: Online Plain Text English Dictionary
  10. overconfidence: Webster's Revised Unabridged, 1913 Edition
  11. overconfidence: Rhymezone
  12. Overconfidence: AllWords.com Multi-Lingual Dictionary
  13. overconfidence: Webster's 1828 Dictionary
  14. overconfidence: FreeDictionary.org
  15. overconfidence: Mnemonic Dictionary
  16. overconfidence: TheFreeDictionary.com

Business (1 matching dictionary)
  1. overconfidence: Legal dictionary

Computing (1 matching dictionary)
  1. overconfidence: Encyclopedia

Medicine (1 matching dictionary)
  1. overconfidence: Medical dictionary

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Definitions from Wiktionary (overconfidence)

▸ noun:  An excessive or unwarranted degree of confidence.

Similar:
cocksureness, certitude, overplacement, overestimation, overoptimism, overpresumption, overdaring, overexpectation, overbelief, overhope, more...

Opposite:
humility, modesty, caution, prudence, hesitation

Types:
hubris, arrogance, conceit, self-importance, vanity, egotism, more...

Phrases:
overconfidence bias, Overconfidence effect, more...

Adjectives:
such, own, military, dangerous, same, general, arrogant, extreme, american, apparent, naive



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Similar:
cocksureness, certitude, overplacement, overestimation, overoptimism, overpresumption, overdaring, overexpectation, overbelief, overhope, more...

Opposite:
humility, modesty, caution, prudence, hesitation

Types:
hubris, arrogance, conceit, self-importance, vanity, egotism, more...

Phrases:
overconfidence bias, Overconfidence effect, more...

Adjectives:
such, own, military, dangerous, same, general, arrogant, extreme, american, apparent, naive



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