adjective

Very skilled or proficient at something.

she is adept at cutting through red tape

expert,proficient,accomplished,skilful,talented,gifted,masterly,virtuoso,consummate,peerless

noun

A person who is skilled or proficient at something.

he is an adept at imitation

expert,past master,master,master hand,genius,virtuoso,maestro,doyen,artist,professional,veteran,old hand