CERTAIN

adj. 1 determined, set, fixed, predetermined, decided, settled, firm, stable, invariable, established, standard, constant, unchanging, steady, unfluctuating, non-fluctuating, traditional He agreed to pay a certain yearly rent She met him there every day at a certain time. 2 sure, unerring, definite, dependable, trustworthy, unfailing, infallible, reliable, assured, guaranteed How do you know that the dividend is certain? 3 sure, inevitable, inescapable, destined, predestined, ineluctable, inexorable, unavoidable, definite, firm; unchanging, changeless, infallible, permanent, Colloq on the cards, a sure thing, US in the cards It is not always certain that justice will triumph Nothing is certain but death and taxes. 4 indubitable, indisputable, undisputed, undoubted, sure, doubtless, unequivocal, incontestable, undeniable, incontrovertible, absolute, irrefutable, unquestionable, unquestioned, unarguable, valid It is certain only that we exist, according to Descartes 5 confident; assured, sure, positive, definite I am certain that she did not steal the money 6 specific, particular, definite; unnamed, unspecified, non-specified, non-specific He gave us certain information which we now have reason to doubt