Liar

From BiblePortal Wikipedia

Vine's Expository Dictionary of NT Words [1]

A — 1: Ψεύστης (Strong'S #5583 — Noun Masculine — pseustes — psyoos-tace' )

"a liar," occurs in  John 8:44,55;  Romans 3:4;  1—Timothy 1:10;  Titus 1:12;  1—John 1:10;  2:4,22;  4:20;  5:10 .

B — 1: Ψευδής (Strong'S #5571 — Adjective — pseudes — psyoo-dace' )

"lying, false" (Eng., "pseudo-"), rendered "false" in  Acts 6:13 and in the RV of   Revelation 2:2 (AV, "liars"), is used as a noun, "liars," in   Revelation 21:8 . See False.

King James Dictionary [2]

LIA'R, n. from lie.

1. A person who knowingly utters falsehood one who declares to another as a fact what he knows to be not true, and with an intention to deceive him. The uttering of falsehood by mistake, and without an intention to deceive, does not constitute one a liar. 2. One who denies Christ.  1 John 2 .

Webster's Dictionary [3]

(n.) A person who knowingly utters falsehood; one who lies.

References