IPA: /dɪsˈhɑːrmənɪk/
KK: /dɪsˈhɑːrmənɪk/
Not in harmony or agreement; lacking a pleasing arrangement or combination.
The disharmonic sounds from the instruments made the performance difficult to enjoy.
Disharmonic → It is formed from "dis-" (meaning apart or not) and "harmonic" (from Greek "harmonikos", meaning relating to harmony). The word "disharmonic" means not in harmony or lacking harmony.
Think of 'not' or 'apart' ('dis-') from 'harmony' — that's why disharmonic means lacking harmony.