Mendacious

//mɛnˈdeɪʃəs// adj

adj ·Uncommon ·College level

Definitions

Adjective
  1. 1
    Lying, untruthful or dishonest.

    "He was dismissed as a mendacious witness."

  2. 2
    False or untrue.

    "mendacious propaganda"

Adjective
  1. 1
    given to lying wordnet
  2. 2
    intentionally untrue wordnet

Synonyms

All synonyms
falseuntruthfuldeceitfuldishonestfallaciouslying

Example

More examples

"My wife is mendacious for dating another man behind my back."

Etymology

Borrowed from Middle French mendacieux, from Latin mendācium (“lie, untruth”), from mendāx (“lying”).

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.