usage: having or feeling no doubt or uncertainty; confident and assured; "felt certain of success"; "was sure (or certain) she had seen it"; "was very sure in his beliefs"; "sure of her friends"
2. certain, sure, careful (vs. careless)
usage: 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"
3. certain (vs. uncertain), sure, bound(predicate), destined, doomed, fated, foreordained, predestinate, predestined, in for(predicate), predictable
usage: 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"
4. sure, secure (vs. insecure)
usage: physically secure or dependable; "a sure footing"; "was on sure ground"
usage: impossible to doubt or dispute; "indisputable (or sure) proof"
1. surely, certainly, sure, for sure, for certain, sure enough, sure as shooting
usage: definitely or positively (`sure' is sometimes used informally for `surely'); "the results are surely encouraging"; "she certainly is a hard worker"; "it's going to be a good day for sure"; "they are coming, for certain"; "they thought he had been killed sure enough"; "he'll win sure as shooting"; "they sure smell good"; "sure he'll come"