cacophonous UK /kəˈkɒfənəs/US /kəˈkɑfənəs/ adjective1 •Containing, consisting of, or producing harsh, unpleasant or discordant sounds.The good thing about this job is that it gives me time and space to contemplate the future at my leisure, whilst the city sleeps, free from the cacophonous curiosity of the hoi polloi. — 1993 formsmore cacophonous · most cacophonous