in ‧ fre ‧ quent ‧ ly /ɪnˈfriːkwəntli/ BrE AmE adverb
[ Word Family: verb : ↑ frequent ; noun : ↑ frequency ≠ ↑ infrequency ; adverb : ↑ frequently ≠ ↑ infrequently ; adjective : ↑ frequent ≠ ↑ infrequent ]
1 . not often SYN rarely OPP frequently :
Jeremy does play cricket, but very infrequently.
2 . not infrequently formal fairly often:
The censors changed some names and dialogue and, not infrequently, banned controversial films.