Synonyms of irregularly

2 Syllables
seldom, slapdash
3 Syllables
fitfully, jerkily, anyhow, variably
4 Syllables
uncommonly, unreliably, willy-nilly, unpunctually, everyway, infrequently, helter-skelter, uncertainly, whimsically, unevenly, haphazardly
5 Syllables
disconnectedly, discontinuously, everywhither, eccentrically, occasionally, sporadically, periodically, spasmodically, erratically, inhabitually
6 Syllables
unmethodically