1.Definition: (of persons) worthy of trust or confidence
"A sure (or trusted) friend"
2.Definition: certain not to fail
"A sure hand on the throttle"
3.Definition: certain to occur; destined or inevitable
"Sudden but sure regret", "He is sure to win"
4.Definition: exercising or taking care great enough to bring assurance
"Be sure to lock the doors"
5.Definition: having or feeling no doubt or uncertainty; confident and assured
"Was sure (or certain) she had seen it", "Was very sure in his beliefs", "Sure of her friends"
6.Definition: impossible to doubt or dispute
"Indisputable (or sure) proof"
7.Definition: infallible or unfailing
"A sure (or true) sign of one's commitment"
8.Definition: physically secure or dependable
"A sure footing", "Was on sure ground"
9.Definition: reliable in operation or effect
"A sure way to distinguish the two", "Wood dust is a sure sign of termites"