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.

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