Adverb
sporadically and infrequently
Source: WordNethe was arrogant and occasionally callous Source: Internet
open areas are only occasionally interrupted by clumps of trees Source: Internet
they visit New York on occasion Source: Internet
now and again she would take her favorite book from the shelf and read to us Source: Internet
as we drove along, the beautiful scenery now and then attracted his attention Source: Internet
Although, it hasn’t been all rainbows and sunshine, we all get frustrated now and again. Source: Internet