14 entries under erratic topic. ×

19
recurrent(adjective, exact, ordinary, usual, steady)
15
intermittent(adjective, continue, common, uncertain, regular)
15
cyclic(adjective, exact, ordinary, usual, steady)
13
periodical(noun, adjective, continue, regular, irregular)
9
spasmodic(adjective, twitching)
8
seasonal(adjective, usual, regular, irregular, standard)
6
epochal(adjective, regular, irregular, infrequent)
6
isochronal(adjective, regular, irregular, repetition)
6
isochronous(adjective, regular, irregular, repetition)
3
every other(expression, adjective, idiom, irregular)
1
by bits and pieces(expression, adjective, idiom, irregular)
1
here and there(expression, adjective, idiom, irregular)
1
iterant(adjective, irregular, infrequent, recurrent)
1
stop-and-go(adjective, irregular, infrequent, recurrent)
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APASmart Define. (2015). periodic thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/periodic/thesaurus/synonyms
ChicagoSmart Define. 2015. "periodic thesaurus" https://smartdefine.org/periodic/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, periodic thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/periodic/thesaurus/synonyms>.
MLASmart Define. "periodic thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/periodic/thesaurus/synonyms>