suppositional vs suppositious

suppositional and suppositious both are adjectives.

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

As adjectives, suppositional and suppositious are synonyms defined as:

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

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

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