one time before (adjective, adverb) once: in the past; occurred one time only
Sinonime: actually, categorically, come hell or high water, conclusively, decidedly, decisively, definitely, doubtless,
easily,
exactly, for sure, no ifs ands or buts, no strings attached, on the button, on the money, on the nose, positively,
precisely,
really, right on, straight out, sure as can be, sure as hell, sure enough, sure thing, surely, the very thing,
truly, unambiguously, unconditionally, unquestionably
Antonime: doubtful,
indefinite, not certain, not sure,
questionable