[adj] exercising or taking care great enough to bring assurance; "be certain to disconnect the iron when you are through"; "be sure to lock the doors"
[adj] certain to occur; destined or inevitable; "he was certain to fail"; "his fate is certain"; "In this life nothing is certain but death and taxes"- Benjamin Franklin; "he faced certain death"; "sudden but sure regret"; "he is sure to win"
[adj] capable of being depended on; "a quick and certain remedy"; "a sure way to distinguish the two"; "wood dust is a sure sign of termites"
[adj] established irrevocably; "his fate is sealed"
bound(p), careful, dependable, destined, doomed, fated, foreordained, in for(p), predestinate, predestined, reliable, sealed, sure