onus probandi (noun) burden of proof: responsibility to prove something
Sinonime: betwixt and between,
changing,
doubtful, faltering,
hesitant, hesitating, hot and cold,
incomplete,
indecisive,
irresolute,
moot, open to question,
pending, problematical, pussyfooting, unanswered, unconcluded,
undecided, undetermined, unfinished,
unsettled, unsolved, up in the air,
vacillating,
vague, waffling
Antonime: certain,
definite, resolved,
settled, solved,
sure