infrequent 10 Associations

occasional (similar term) rare (similar term) sporadic (related term) frequent (antonym)

irregular 9 Associations

asymmetrical (similar term) crooked (similar term) casual (similar term) occasional (similar term) improper (similar term) unconventional (similar term) unlawful (similar term)

unpredictable 13 Associations

aleatory (similar term) capricious (similar term) freakish (similar term) episodic (similar term) occasional (similar term) unforeseeable (similar term) uncertain (related term)