Standard Lemma guide

mendacious

adj · 4 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • /mɛnˈdeɪʃəs/
  • US: Recorded audio is listed in the source snapshot.
  • rhymes with -eɪʃəs
  • CMU ARPABET: M EH0 N D EY1 SH AH0 S Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

adj

Meaning 1

Lying, untruthful or dishonest.

Definition source: English Wiktionary via Wiktextract

Examples

  • He was dismissed as a mendacious witness.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

adj

Meaning 2

False or untrue.

Definition source: English Wiktionary via Wiktextract

Qualifier: etc

Examples

  • mendacious propaganda
  • utterly mendacious
  • The report was filled with mendacious claims.

Meaning relationships

Synonyms: bastard, counterfactual, erroneous, fallacious, false, fictitious, inaccurate, incorrect, invented, made up, nonfactual, nontrue, nontruthful, pseudo-, spurious, untrue, untruthful, unveracious, unveridical, wrong

Antonyms: none provided

3

adjective satellite

Meaning 3

given to lying

Definition source: Princeton WordNet 3.0

Examples

  • a mendacious child

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

adjective satellite

Meaning 4

intentionally untrue

Definition source: Princeton WordNet 3.0

Examples

  • a mendacious statement

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

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

Across languages

Translations

52 source translations are retained for this English entry.

  • Afrikaans: leunagtig — lying, untruthful or dishonest
  • Afrikaans: oneerlik — lying, untruthful or dishonest
  • Afrikaans: liegend — lying, untruthful or dishonest
  • Arabic: كَاذِب (kāḏib) — lying, untruthful or dishonest
  • Armenian: ստախոս (staxos) — lying, untruthful or dishonest
  • Armenian: սուտասան (sutasan) — lying, untruthful or dishonest
  • Bulgarian: лъжлив (lǎžliv) — lying, untruthful or dishonest
  • Catalan: mentider — lying, untruthful or dishonest
  • Chinese Mandarin: 說謊的 /说谎的 (shuōhuǎng de) — lying, untruthful or dishonest
  • Czech: prolhaný — lying, untruthful or dishonest
  • Dutch: leugenachtig — lying, untruthful or dishonest
  • Dutch: oneerlijk — lying, untruthful or dishonest
  • Dutch: liegend — lying, untruthful or dishonest
  • Finnish: valheellinen — lying, untruthful or dishonest
  • French: fallacieux — lying, untruthful or dishonest
  • French: mensonger — lying, untruthful or dishonest
  • French: trompeur — lying, untruthful or dishonest
  • Georgian: ცრუ (cru) — lying, untruthful or dishonest
  • German: lügnerisch — lying, untruthful or dishonest
  • German: verlogen — lying, untruthful or dishonest
  • German: unwahr — lying, untruthful or dishonest
  • Greek: αναληθής (analithís) — lying, untruthful or dishonest
  • Ancient Greek: ψευδολόγος (pseudológos) — lying, untruthful or dishonest
  • Hebrew: שקרן — lying, untruthful or dishonest
  • Hebrew: לא ישר — lying, untruthful or dishonest
  • Hungarian: hazug — lying, untruthful or dishonest
  • Hungarian: hazudozó — lying, untruthful or dishonest
  • Irish: bréagach — lying, untruthful or dishonest
  • Italian: mendace — lying, untruthful or dishonest
  • Italian: menzognero — lying, untruthful or dishonest
  • Italian: bugiardo — lying, untruthful or dishonest
  • Japanese: 虚偽の (kyogi no) — lying, untruthful or dishonest
  • Japanese: 不正直 (fushōjiki) — lying, untruthful or dishonest
  • Northern Kurdish: derewîn — lying, untruthful or dishonest
  • Latin: mendax — lying, untruthful or dishonest
  • Norwegian Bokmål: løgnaktig — lying, untruthful or dishonest
  • Plautdietsch: läajesoatich — lying, untruthful or dishonest
  • Portuguese: mentiroso — lying, untruthful or dishonest
  • Portuguese: mendaz — lying, untruthful or dishonest
  • Romanian: mincinos — lying, untruthful or dishonest
  • Russian: лжи́вый (lžívyj) — lying, untruthful or dishonest
  • Serbo-Croatian: ла̀жљив — lying, untruthful or dishonest
  • Serbo-Croatian: làžljiv — lying, untruthful or dishonest
  • Spanish: mentiroso — lying, untruthful or dishonest
  • Spanish: embustero — lying, untruthful or dishonest
  • Spanish: mendaz — lying, untruthful or dishonest
  • Spanish: mendigo — lying, untruthful or dishonest
  • Spanish: mendiga — lying, untruthful or dishonest
  • Swedish: lögnaktig — lying, untruthful or dishonest
  • Swedish: förljugen — lying, untruthful or dishonest
  • Ukrainian: брехли́вий (brexlývyj) — lying, untruthful or dishonest
  • Welsh: celwyddog — lying, untruthful or dishonest