The word 'vaunting' originates from the core notion of emptiness and futility. Its journey begins with the Proto-Indo-European root h₁weh₂- (to leave, abandon, give out), which evolved into the Latin adjective vanus, meaning 'empty, void, or vain'. From vanus came the Late Latin verb vanitare (to talk emptily, to boast), which passed into Old French as vanter. The Anglo-French variant vaunter was adopted into Middle English. The addition of the Old English participial suffix -ing transforms the act of boasting into an adjective describing someone who is engaged in or characterized by such speech. Thus, the literal meaning progressed from 'empty' to 'talking emptily' to its modern sense of speaking with boastful pride.

Structure: vaunt (boast) + ing (adjective suffix) - vaunt: From Anglo-French vaunter, Old French vanter, from Late Latin vanitare (to boast), from Latin vanus (empty, vain). Functions as the core verb root meaning "to boast". - ing: From Old English -ende, -unge, a suffix forming present participles and adjectives from verbs. Functions as an adjective-forming suffix indicating the action or state of the verb.