adj. 1.having or feeling no doubt or uncertainty 2.exercising or taking care great enough to bring assurance 3.certain to occur 4.physically secure or dependable 5.capable of being depended on 6.(of persons) worthy of trust or confidence 7.infallible or unfailing 8.certain not to fail 9.impossible to doubt or dispute sure adv. 1.definitely or positively (`sure' is sometimes used informally for `surely')
