Sure

1. (superl.) Certainly knowing and believing; confident beyond doubt; implicitly trusting; unquestioning; positive.

2. (superl.) Certain to find or retain; as, to be sure of game; to be sure of success; to be sure of life or health.

3. (superl.) Fit or worthy to be depended on; certain not to fail or disappoint expectation; unfailing; strong; permanent; enduring.

4. (superl.) Betrothed; engaged to marry.

5. (superl.) Free from danger; safe; secure.

6. (adv.) In a sure manner; safely; certainly.

Thesaurus Entries

OK, Roger, abiding, absolute, absolutely, accurate, adducible, admissible, agape, agog, all agog, all right, alright, alrighty, amen, anticipant, anticipating, anticipative, anticipatory, apodictic, arrogant, as you say, assured, assuredly, attestative, attestive, authentic, awaiting, aye, based on, believing, bound, by all means, calculable, certain, certainly, certified, changeless, circumstantial, clear, clear and distinct, clear as day, cocksure, cocky, conclusive, confident, constant, convinced, convincing, covered, cumulative, da, damning, decided, decisive, definite, dependable, determinate, determinative, determined, devout, documentary, documented, dogmatic, doubtless, eager, effective, enduring, ensured, established, evidential, evidentiary, ex parte, exactly, expectant, expecting, eye-witness, factual, faithful, faithworthy, fast, fated, fateful, fideistic, final, fine, firm, firsthand, fixed, foolproof, forearmed, forestalling, forewarned, founded on, gaping, genuine, good, good enough, grounded on, guaranteed, hear, hearsay, hopeful, hubristic, implicit, impressed with, in anticipation, in expectation, incontestable, incontrovertible, incorruptible, indeed, indeedy, indefeasible, indicative, indisputable, indubitable, ineluctable, inerrable, inerrant, inescapable, inevasible, inevitable, inexorable, infallible, inflexible, insured, invincible, inviolable, irrefutable, irresistible, irrevocable, ja, just so, looking for, looking forward to, mais oui, material, most assuredly, naturally, naturellement, necessary, never-failing, not surprised, nuncupative, of course, okay, optimistic, oui, overconfident, oversure, overweening, overwhelming, perfectly sure, persuaded, pert, pietistic, pious, pistic, poised, pompous, positive, positively, precisely, predestined, predetermined, predictable, prepared, presumptive, probative, proud, proven, quite, rather, ready, real, really, reassured, reliable, resistless, responsible, right, righto, safe, sanguine, satisfied, secure, secured, self-assured, self-confident, self-important, self-possessed, self-reliant, self-satisfied, set, significant, sold on, solid, sound, stable, staunch, steadfast, steady, straight, strong, substantial, suggestive, sure as death, sure as fate, sure thing, sure-enough, sure-fire, surefire, surely, symptomatic, telling, tested, to be sure, to be trusted, tried, tried and true, TRUE, truly, trustable, trustworthy, trusty, unafraid, unambiguous, unavoidable, unchangeable, unchanging, uncompromising, uncontestable, uncontrollable, undeflectable, undeniable, under the impression, undeviating, undoubtful, undoubting, unequivocal, unerring, unfailing, unfalse, unfaltering, unflinching, unhesitating, univocal, unmistakable, unperfidious, unpreventable, unqualified, unquestionable, unquestioning