One who or that which is false. What is false; falsehood. Obsolete except as absolute use of the adjective.

That which, or something that, is contrary to fact or truth; an untrue proposition, doctrine, belief, etc.; untrue propositions, etc. in general.

Something that is false. An untrue proposition, doctrine, or statement; an error or falsehood. Also in generalized sense, that which is untrue…

A proposition or statement that is (taken to be) actually self-contradictory, absurd, or intrinsically unreasonable.

A mistake or fault in procedure, argument, inference, etc.

A mistaken or delusory belief or idea, an error, esp. one founded on unsound reasoning.

(a) ‘An assertion or statement, the falsity of which is plainly apparent’ (Welsh). (b) A platitude that has not even the merit of being true.

An untruth; a fictitious or mistaken statement.