supposititious

As adjectives the difference between false and supposititious

is that false is untrue, not factual, factually incorrect while supposititious is spurious; substituted for the genuine, counterfeit.

As a noun false

is one of two options on a true-or-false test.

As an adverb false

is not truly; not honestly; falsely.

Supposititious is a related term of bastard.

As an adjective supposititious

is spurious; substituted for the genuine, counterfeit.

As a noun bastard is

bastard (a person born to unmarried parents; also used as an insult).

Spurious is a synonym of supposititious.

As adjectives the difference between spurious and supposititious

is that spurious is false, not authentic, not genuine while supposititious is spurious; substituted for the genuine, counterfeit.

Adulterate is a related term of supposititious.

As adjectives the difference between adulterate and supposititious

is that adulterate is tending to commit adultery while supposititious is spurious; substituted for the genuine, counterfeit.

As a verb adulterate

is to corrupt.

As adjectives the difference between forged and supposititious

is that forged is fake (as documents) while supposititious is spurious; substituted for the genuine, counterfeit.

As a verb forged

is to force forward against opposition.