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in‧fre‧quent‧ly

1 not often [= rarely; ≠ frequently]:
Jeremy does play cricket, but very infrequently.
Jeremy does play cricket, but very infrequently.2 fairly often :
The censors changed some names and dialogue and, not infrequently, banned controversial films.
not infrequently
formal
The censors changed some names and dialogue and, not infrequently, banned controversial films.