Standard Lemma guide

perfidiously

adv · 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

adv

Meaning 1

In a perfidious manner.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: dastardly, proditoriously, traitorly, disloyally, false, falsely, Judasly, perfidiously, ratlike, traitorously, traitorwise, treacherously, unfaithfully

Antonyms: none provided

2

adverb

Meaning 2

in a perfidious manner

Definition source: Princeton WordNet 3.0

Examples

  • he was playing perfidiously one side against the other

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

Etymology tree English perfidious Middle English -ly English -ly English perfidiously From perfidious + -ly.

Across languages

Translations

5 source translations are retained for this English entry.

  • German: heimtückisch — in a perfidious manner
  • German: treulos — in a perfidious manner
  • Polish: perfidnie — in a perfidious manner
  • Turkish: haince — in a perfidious manner
  • Turkish: kalleşçe — in a perfidious manner