no ifs ands or buts about it

absolute evident irrefutable unassailable undeniable unquestionable

accurate actual certain double-checked incontestable incontrovertible indubitable no mistake open and shut positive real sure that's a fact true undoubted unfabled veridical

disputable doubtful indefinite questionable uncertain unsure

dubious refutable unreliable vague

absolutely beyond a doubt beyond any doubt beyond doubt categorically certainly clearly definitely indubitably obviously undeniably unquestionably

absolutely clearly decidedly doubtless easily finally obviously plainly surely undeniably unequivocally unquestionably

beyond any doubt categorically doubtlessly explicitly expressly far and away indubitably positively specifically unmistakably without doubt without fail without question

doubtedly doubtfully dubiously questionable questionably uncertain

indefinitely