Synonyms of the word

mendacious

• adj. (of a person) Lying, untruthful or dishonest.
• adj. (of a statement, etc) False or untrue.

false

• adj. Untrue, not factual, factually incorrect.
• adj. Based on factually incorrect premises.
• adj. Spurious, artificial.
• adj. (logic) Of a state in Boolean logic that indicates a negative result.
• adj. Uttering falsehood; dishonest or deceitful.
• adj. Not faithful or loyal, as to obligations, allegiance, vows, etc.; untrue; treacherous.
• adj. Not well founded; not firm or trustworthy; erroneous.
• adj. Not essential or permanent, as parts of a structure which are temporary or supplemental.
• adj. (music) Out of tune.
• adv. Not truly; not honestly; falsely.
• n. One of two options on a true-or-false test.

lying

• v. present participle of lie (“to rest in a horizontal position”).
• n. The act of one who lies, or keeps low to the ground.
• v. present participle of lie (“to intentionally give false information”).
• n. An act of telling a lie or falsehood.

untruthful

• adj. Not giving the truth; providing untrue facts; lying.
• adj. Pertaining to falsehood; corrupt; dishonest.