Open English Wordnet
Adjectives
(a)echoic, imitative, onomatopoeic, onomatopoeical, onomatopoetic(of words) formed in imitation of a natural sound“onomatopoeic words are imitative of noises”, “it was independently developed in more than one place as an onomatopoetic term” (Harry Hoijer)
(a)counterfeit, imitativenot genuine; imitating something superior“counterfeit emotion”, “counterfeit money”, “counterfeit works of art”, “a counterfeit prince”