Most arrogant, boastful, or overly confident in an annoying way; the superlative of cocky.
Superlative form of 'cocky,' following English superlative rules with '-est' added to the base adjective.
English superlatives like 'cockiest' are interesting because they often get used ironically—we frequently call someone 'the cockiest person I know' in a tone that's half-admiring, showing that pure arrogance sometimes gets grudging respect.
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