Question

not rarely, not seldom adv.https://interslavic-dictionary.com/?text=id36443&lang=isv-enuncommon (20%*) fr.22900 нередко нерідко nezřídka нерядко неретко !ne redko; ne redko

Accepted Answer

5582 nerědko нярэдка; часцяком; звычайна nierzadko nezriedka неретко nerijetko; često. prilično često

English	not rarely, not seldom
Frequency	5582
Part of speech	adv. https://interslavic-dictionary.com/?text=id36443&lang=isv-en uncommon (20%*) fr.22900
Interslavic	nerědko
Russian	нередко
Belarusian	нярэдка; часцяком; звычайна
Ukrainian	нерідко
Polish	nierzadko
Czech	nezřídka
Slovak	nezriedka
Bulgarian	нерядко
Macedonian	неретко
Serbian	неретко
Croatian	nerijetko; često. prilično često
Slovene	!ne redko; ne redko

неретко Rarely Seldom Uncommon Fr.22900 Nerědko нередко нярэдка