Synonym: absolute, certain, decided, definite, positive. Antonym: unsure. Similar words: assure, ensure, for sure, exposure, make sure, measure up, measure up to, measurement. Meaning: [ʃʊr /ʃʊə] 
adj. 1. having or feeling no doubt or uncertainty; confident and assured 2. exercising or taking care great enough to bring assurance 3. certain to occur; destined or inevitable 4. physically secure or dependable 5. reliable in operation or effect 6. (of persons) worthy of trust or confidence 7. infallible or unfailing 8. certain not to fail 9. impossible to doubt or dispute. adv. definitely or positively (`sure' is sometimes used informally for `surely').
adj. 1. having or feeling no doubt or uncertainty; confident and assured 2. exercising or taking care great enough to bring assurance 3. certain to occur; destined or inevitable 4. physically secure or dependable 5. reliable in operation or effect 6. (of persons) worthy of trust or confidence 7. infallible or unfailing 8. certain not to fail 9. impossible to doubt or dispute. adv. definitely or positively (`sure' is sometimes used informally for `surely'). 
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211. In severe cold, your fingers can freeze onto metal handles, so be sure to cover your hands.
212. Be sure to bar all the doors before you leave.
213. I'm not sure I understand what you're driving at .
214. She was not yet sure if she could trust him.
215. I'm sure he only said it out of / from spite.
216. Make sure that all sharp implements, such as scythes,[Sentence dictionary] have covers.
217. He was sure that the man was innocent of any crime.
218. I'm sure that Jack and Mary can be brought together.
219. I'm sure at some point in the future I'll want a baby.
220. Make sure the panels are treated with a wood preservative.
More similar words: assure, ensure, for sure, exposure, make sure, measure up, measure up to, measurement, survey, surgeon, surgery, surface, survival, survivor, surround, insurance, surprising, surrounding, surveillance, surprisingly, bureau, injure, figure, gesture, feature, culture, picture, lecture, texture, venture.