IPA: /ɪnˈfrɛkənsi/
KK: /ɪnˈfrɛkənsi/
The quality or state of happening rarely or not often.
The infrequency of the bus service made it difficult for residents to rely on public transportation.
Infrequency → It is formed from "in-" (meaning not) and "frequentia" (from Latin, meaning frequency or occurrence). The word "infrequency" means the state of not occurring often or being rare.
Think of 'not' ('in-') occurring often ('frequentia') — that's why infrequency means something that doesn't happen frequently.