no ifs and or buts (adjective) undeniable: definite, proven
Sinonime: actual, beyond doubt, beyond question,
binding,
certain,
clear,
compulsory,
evident, for sure, inarguable, incontestable,
incontrovertible, indisputable,
indubitable,
irrefutable,
manifest,
necessary, no ifs and or buts,
obligatory,
obvious, open and shut,
patent,
positive,
real,
sound,
sure, sure thing,
true, unanswerable, unassailable, undoubted, unquestionable
Antonime: contestable, disputable, doubted,
indefinite, unproven