Assuredly

Adverb

 * 1) In a assured manner; certainly.

Thesaurus
OK; Roger; absolutely; actually; all right; alright; alrighty; amen; and no mistake; as you say; at all events; at any rate; aye; by all means; certainly; clearly; da; decidedly; decisively; definitely; demonstrably; distinctly; exactly; fine; for a certainty; for a fact; for certain; for real; for sure; forsooth; good; good enough; hear; in all conscience; in truth; indeed; indeedy; indubitably; ja; just so; mais oui; manifestly; most assuredly; most certainly; naturally; naturellement; nothing else but; noticeably; observably; obviously; of course; okay; oui; patently; positively; precisely; quite; rather; really; right; righto; sensibly; seriously; sure; sure thing; surely; to a certainty; to be sure; truly; unambiguously; undeniably; unequivocally; unmistakably; verily; very well; visibly; well and good; why yes; without doubt; yea; yeah; yep; yes; yes indeed; yes indeedy; yes sir; yes sirree