20 entries under irregular 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)
11
occasional(adjective, continue, regular, infrequent)
10
fitful(adjective, continue, sporadic)
8
recurring(adjective, regular, normal, infrequent)
8
seasonal(adjective, usual, regular, standard)
6
epochal(adjective, regular, erratic, infrequent)
6
isochronal(adjective, regular, repetition, erratic)
6
isochronous(adjective, regular, repetition, erratic)
4
iterative(adjective, infrequent, recurrent, sporadic)
4
on-again-off-again(adjective, uncertain, regular, broken)
4
random(adjective, restless, disturbed, broken)
3
every other(expression, adjective, idiom, erratic)
1
by bits and pieces(expression, adjective, idiom, erratic)
1
here and there(expression, adjective, idiom, erratic)
1
iterant(adjective, erratic, infrequent, recurrent)
1
stop-and-go(adjective, erratic, infrequent, recurrent)
0
now then(expression, adjective, infrequent, sporadic)
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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>