The noun derivative means something which has been developed or obtained from something else. The adjective derivative means something that is criticized because it is not new or original but has been developed from something else.
Synonyms are subordinate, secondary, by-product, or off-shoot.
The word origins from Old French derivatif (15th century) and directly from Late Latin derivativus, from derivat-, past-participle stem of Latin derivare meaning “to lead or draw off”. Its meaning “taken or having proceeded from another or others, secondary” is from 1520s.
This repetitive music sounds derivative.
People didn’t patronize their dull, derivative debut album.
Stand-up comedy on our time was already derivative.