sure

adjectives

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"
is derived from
antonym
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"
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"
physically secure or dependable
"a sure footing"; "was on sure ground"
is similar to
free from danger or risk
"secure from harm"; "his fortune was secure"; "made a secure place for himself in his field"
reliable in operation or effect
"a quick and certain remedy"; "a sure way to distinguish the two"; "wood dust is a sure sign of termites"
(of persons) worthy of trust or confidence
"a sure (or trusted) friend"
infallible or unfailing
"a sure (or true) sign of one's commitment"
is derived from
is similar to
consistent with fact or reality; not false
"the story is true"; "it is undesirable to believe a proposition when there is no ground whatever for supposing it true"- B. Russell; "the true meaning of the statement"
certain not to fail
"a sure hand on the throttle"
is derived from
is similar to
not subject to change or variation especially in behavior
"a steady beat"; "a steady job"; "a steady breeze"; "a steady increase"; "a good steady ballplayer"
impossible to doubt or dispute
"indisputable (or sure) proof"

adverbs

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"