conjectural vs suppositious

conjectural and suppositious both are adjectives.

Word	Noun	Adjective	Verb	Adverb
conjectural	No	Yes	No	No
suppositious	No	Yes	No	No

As adjectives, conjectural and suppositious are synonyms defined as:

conjectural and suppositious: based primarily on surmise rather than adequate evidence

Other synonyms of conjectural include divinatory, hypothetic, hypothetical, supposed, suppositional, supposititious.

conjectural (adjective)	suppositious (adjective)
based primarily on surmise rather than adequate evidence	based primarily on surmise rather than adequate evidence