IPA: /juːˈfoʊniəsnəs/
KK: /juˈfoʊniəsnəs/
The quality of being pleasant to hear; a harmonious sound.
The euphoniousness of the choir's performance left the audience in awe.
Euphoniousness → It is formed from "eu-" (meaning good or well) and "phone" (from Greek "phōnē", meaning voice or sound) and the suffix "-ous" (meaning full of) and "-ness" (meaning the state of). The word describes the state of being full of good sound or pleasant to hear.
Think of 'good sound' ('eu-' means good and 'phone' means sound) to remember that 'euphoniousness' refers to the quality of being pleasing to the ear.