Standard Lemma guide

unfaithfulness

noun · 2 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

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1

noun

Meaning 1

The characteristic of being unfaithful.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: infidelity, disloyalty

Antonyms: faithfulness, fidelity, loyalty

2

noun

Meaning 2

the quality of being unfaithful

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: infidelity

Antonyms: faithfulness

Broader terms: quality

Narrower terms: faithlessness, falseness, fickleness, inconstancy, disloyalty

History

Etymology

Etymology tree English unfaithful Proto-Germanic *-in- Proto-Indo-European *-h2 Proto-Indo-European *-éh2 Proto-Indo-European *-yéti Proto-Indo-European *-eh2yéti Proto-Indo-European *-h2ti Proto-Germanic *-ōną Proto-Germanic *-inōną Proto-Indo-European *-dyé- Proto-Germanic *-atjaną Proto-Indo-European *-tus Proto-Germanic *-þuz Proto-Germanic *-assuz Proto-Germanic *-inassuz Proto-West Germanic *-nassī Old English -nes Middle English -nesse English -ness English unfaithfulness From unfaithful + -ness.

Across languages

Translations

20 source translations are retained for this English entry.

  • Arabic: خِيَانَة (ḵiyāna) — characteristic of being unfaithful
  • Bulgarian: невярност (nevjarnost) — characteristic of being unfaithful
  • Bulgarian: нелоялност (nelojalnost) — characteristic of being unfaithful
  • Catalan: infidelitat — characteristic of being unfaithful
  • Chinese Mandarin: 異心 /异心 (yìxīn) — characteristic of being unfaithful
  • Chinese Mandarin: 不貞 /不贞 (bùzhēn) — characteristic of being unfaithful
  • Danish: utroskab — characteristic of being unfaithful
  • Esperanto: malfidelo — characteristic of being unfaithful
  • French: infidélité — characteristic of being unfaithful
  • Georgian: ორგულობა (orguloba) — characteristic of being unfaithful
  • Irish: neamhdhlisteanacht — characteristic of being unfaithful
  • Irish: mídhílseacht — characteristic of being unfaithful
  • Norwegian Bokmål: utroskap — characteristic of being unfaithful
  • Russian: неве́рность (nevérnostʹ) — characteristic of being unfaithful
  • Spanish: infidelidad — characteristic of being unfaithful
  • Spanish: cuerno — characteristic of being unfaithful
  • Spanish: cuernos — characteristic of being unfaithful
  • Spanish: guampa — characteristic of being unfaithful
  • Ukrainian: невірність (nevirnistʹ) — characteristic of being unfaithful
  • Welsh: anffyddlondeb — characteristic of being unfaithful