Excessively proud of oneself; having an overly high opinion of one's abilities, appearance, or achievements. Characterized by vanity and arrogance.
From 'conceit' meaning 'conception' or 'idea,' originally neutral but evolving to mean 'favorable opinion of oneself.' The word shifted from describing mental conception to describing excessive self-regard.
Think 'conceived' an idea of yourself - but a ridiculously inflated one! Conceited people have conceived (formed) such a high opinion of themselves that it's annoying to others.
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