Synonyms for Once in a while:

• adj.

  •Other relevant words: (adjective)
  • occasionally.

• a. & adv.

  •Other relevant words: (adjective, adverb)
  • once in a while.

• adv

  •at times (adverb)
  • intermittently.
  •every now and then (adverb)
  • ever so often,
  • sometimes.
  •now and then (adverb)
  • on occasion,
  • now then,
  • once again.
  •Other relevant words: (adverb)
  • every now and then,
  • almost never,
  • recurrently,
  • here and there,
  • Unoften,
  • rarely,
  • alternately,
  • discontinuously,
  • at random,
  • off and on,
  • on and off,
  • hardly ever,
  • once in blue moon,
  • Unfrequently,
  • once in awhile,
  • scarcely ever.

• adv.

  •every now and then (adverb)
  • every now then.
  •from time to time (adverb)
  • from time time.
  •now and then (adverb)
  • not often,
  • once or twice.
  •occasionally (adverb)
  • uncommonly.
  •off and on (adverb)
  • vacillating,
  • fluctuating.
  •once in awhile (adverb)
  • more irregularly,
  • most sometimes,
  • more sometimes,
  • more sporadically,
  • most irregularly,
  • most periodically,
  • most sporadically,
  • more periodically,
  • more occasionally,
  • more infrequently.
  •Other relevant words: (adverb)
  • singularly,
  • finely,
  • extraordinarily,
  • on rare occasions,
  • variably.
  •rarely (adverb)
  • extra,
  • extremely,
  • notably,
  • uncommon,
  • little,
  • barely,
  • remarkably,
  • unusually.
  •seldom (adverb)
  • whimsically,
  • scarcely,
  • in a few cases,
  • inhabitually,
  • not very often,
  • a few times.
  •sometimes (adverb)
  • consistently,
  • ever and again,
  • constantly,
  • frequently.

• n.

  •
  • seldom.
  •at times (noun)
  • at times.
  •now and again (noun)
  • now and again.
  •Other relevant words: (noun)
  • now and then.

• Other synonyms:

  •
  • seasonal.
  •from time to time
  • from time to time.
  •rarely
  • blue.
  •Other relevant words (noun):
  • hardly,
  • betimes,
  • infrequently,
  • sporadically,
  • periodically,
  • on divers occasions,
  • irregularly,
  • every once in a while,
  • every so often,
  • at intervals,
  • once and again,
  • Semioccasionally,
  • at various times,
  • once in a blue moon.