SURE

adj. 1 certain, assured, convinced, persuaded, positive, definite, unwavering, unswerving, unflinching, steadfast, steady, unshakeable or unshakable, confident, satisfied, undeviating, unfaltering How can you be so sure in your opinion that Jack did it? I'm sure I've met you before 2 established, firm, solid, trusty, stable, steadfast, secure, safe, trustworthy, reliable I never travel without my sure companions, courage and caution 3 accurate, reliable, dependable, tried and true, unfailing, infallible, foolproof, effective, Colloq sure-fire A high temperature is a sure sign of illness 4 certain, inevitable, indubitable, unavoidable, ineluctable, inescapable, guaranteed He who enters the Devil's Cave meets sure death