Based primarily on surmise rather than adequate evidence:
— Theories about the extinction of dinosaurs are still highly conjectural.

synonyms: divinatory, hypothetic, hypothetical, supposed, suppositional, suppositious, supposititious.

Roget 514: supposing etc. v.; given, mooted, postulatory^†; assumed etc. v.; supposititious, suppositive^†, suppositious; gratuitous, speculative, conjectural, hypothetical, theoretical, academic, supposable, presumptive, putative; suppositional.    suggestive, allusive.    ... show more