aperiodic Antonyms

periodic periodical possessed quarterly relentless scrappy seedling self-asserting self-assertive self-seeking self-willed hourly emulous oscillatory immovable impelled impulsive menstrual militant monomaniacal monthly nightly oscillating semiannually semimonthly undeviating biannual biyearly semiannual midweekly 24-7 bi-annual semestral semestrial well-established unhesitating yearly semiweekly steely stringent tertian triennial undulatory unremitting vying warring warlike bent upon hebdomadary active