Adept means very skilled at something. Practised enough that it looks easy.
It takes at or in: adept at handling difficult customers, adept in three languages. The word suits acquired skill rather than raw talent, which is why it fits people who have clearly done a thing many times. It works as a noun too, and an adept is an expert, though that use is rare and slightly mystical. Do not confuse it with adopt or adapt, which look similar and mean nothing like it.
An adept is somebody who has arrived. Latin adeptus means one who has achieved, from adipiscī, to attain, so skill is described here as a destination reached.
French
adepte
English, today
adept
Built from
Borrowed from French adepte. French adepte, from Latin adeptus (“who has achieved”), the past participle of adipisci (“to attain”).
Etymology from Wiktionary, CC BY-SA