amateur:  Etymologically, an amateur is simply a ‘lover’. That is what its ultimate Latin ancestor amator meant, and indeed in English it still denoted ‘someone who loves or is fond of something’ until well into the 19th century (‘am no amateur of these melons’, Mrs Atkinson, Tartar Steppes 1863). However, its immediate source, French amateur, had already evolved the subsidiary sense ‘one who does something solely for the enjoyment, not for payment’, and that is now its only English meaning.
1784, "one who has a taste for (something)," from French amateur "lover of," from Latin amatorem (nominative amator) "lover," agent noun from amatus, past participle of amare "to love" (see Amy). Meaning "dabbler" (as opposed to professional) is from 1786. As an adjective, by 1838.