IPA: /ɪnˈfrikwəntli/
KK: /ɪnˈfrikwəntli/
Not happening often; occurring rarely.
She visits her grandparents infrequently, usually only on holidays.
Infrequently → It is formed from "in-" (meaning not) and "frequent" (from Latin "frequentem", meaning crowded or repeated) and the suffix "-ly" (meaning in a manner). The word "infrequently" means not occurring often or not happening in a crowded or repeated manner.
Think of 'not' ('in-') happening 'often' ('frequent') — that's why infrequently means something that doesn't happen often.