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Cocksure / cocky
Too confident about yourself and in an annoying, often unpleasant or rude way. Informally, the word ‘cocky’ is more common.
- He was a bit cocky when he was a teenager because he was always getting the best grades in his class.
Bertrand Arthur William Russell (18 May 1872 – 2 February 1970) was a British philosopher, logician, mathematician, historian, and social critic.