Synonyms of periodic

1 Syllable

odd

2 Syllables

weekly, fitful, punctual, annual, monthly, daily, hourly, yearly, odd-lot, chainer, rhythmic, cyclic, frequent, serial

3 Syllables

circadian, routine, iterant, stop-and-go, perennial, regular, sporadic, orbital, infrequent, cyclical, recurring, fluctuating, spasmodic, recurrent, centennial, spurtive, epochal, seasonal, repeated

4 Syllables

occasional, alternate, intermittent, isochronous, recursive, periodical, isochronal

6 Syllables

on-again-off-again