irregular
ir-reg-u-lar
adjective
Not smooth, even, or consistent in shape, arrangement, or occurrence.
"She noticed his irregular breathing."
adjective
Not conforming to established rules, standards, or usual practice.
"He worked irregular hours."
Thesaurus
Synonyms: strong, unconventional, randomised, improper, crooked, asymmetrical, casual, occasional, randomized, unlawful, second, imperfect
Antonyms: regular