IPA: /nɒnˈhɑːmənɪk/
KK: /nɑnˈhɑrmənɪk/
Not related to harmony or not having a harmonious quality.
The nonharmonic tones in the music created a unique and interesting sound.
Nonharmonic → It is formed from "non-" (meaning not) and "harmonic" (from Greek "harmonikos", meaning relating to harmony). The word "nonharmonic" describes something that is not in harmony or does not conform to harmonic principles.
Think of 'non-' meaning 'not' and 'harmonic' relating to 'harmony' — so nonharmonic means something that is not harmonious.