(a.) Dependent on conjecture; fancied; imagined; guessed at; undetermined; doubtful.

abstract academic arguable armchair at issue confutable contestable controversial controvertible debatable deniable disputable doubtable doubtful dubious dubitable hypothetic hypothetical ideal iffy impractical in dispute in doubt in dubio in question mistakable moot notional open to doubt open to question postulatory problematic putative questionable refutable reputed speculative suppositional supposititious suppositive suppository suspect suspicious theoretical