sure adj.
VERBS be, feel, seem, sound You don't seem very sure to me. | make Make sure no one finds out about this. | make sb What makes you so sure she'll come back to you?
ADV. absolutely, completely, damned, quite | doubly To make doubly sure they would not be disturbed she turned the key in the lock. | not altogether, not entirely, not quite, not really I'm not altogether sure he would appreciate your efforts. | fairly, pretty
PREP. about Pottz was confident of taking the American title, but less sure about the world championship. | of You'd better be completely sure of your facts.
You can also check other dicts: sure (English, 中文解释 ), wordnet sense, Collins Definition