expertly

The adverb "expertly" is built upon the adjective "expert," which originates from the Latin past participle expertus, meaning 'having been tried, tested, or experienced.' This derives from the verb experiri ('to try, test'), a compound of ex- ('out') and a base related to peritus ('experienced'), ultimately from the Proto-Indo-European root per- ('to try, risk'). The suffix -ly, of Germanic origin, was used to form adverbs from adjectives. Thus, the literal construction 'in an expert manner' evolved directly from the core idea of performing an action with the skill of one who has been thoroughly tested and proven.

Structure: expert + ly - expert: From Latin expertus ('tried, proved, experienced'), from experiri ('to try, test'). Functions as the adjective/root meaning skilled. - ly: From Old English -līc ('body, form, like'), an adverbial suffix meaning 'in a manner of'.