- 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
Antonym: nonechoic
- echoic, echolike - like or characteristic of an echo
Antonym: unreflected (indirect, via reflected)