suppositious vs supposed

suppositious and supposed both are adjectives.

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

As adjectives, suppositious and supposed are synonyms defined as:

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

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

suppositious (adjective)	supposed (adjective)
based primarily on surmise rather than adequate evidence	required or under orders
	doubtful or suspect
	based primarily on surmise rather than adequate evidence
	mistakenly believed