conjectural vs supposititious

conjectural and supposititious both are adjectives.

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

As adjectives, conjectural and supposititious are synonyms defined as:

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

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

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