perfidiously
perfidiously — adverb
1. describing an action or manner that deliberately breaks faith with someone, show
describing an action or manner that deliberately breaks faith with someone, showing untrustworthiness and a complete lack of loyalty.
Quan perfidiously revealed the location of the secret meeting to their rivals.
perfidiously + verb (revealed) — disclosure of secrets
The general perfidiously tore up the peace treaty only days after signing it.
perfidiously + verb (tore up) — breaking an agreement
Sofia had perfidiously forwarded her colleague's private emails to the manager.
Mizuki realised the contract was a perfidiously crafted trap meant to destroy her career.
Asher spoke perfidiously, praising his friend in public while plotting against him behind his back.
- treacherously
more common; emphasises active deception and danger to the betrayed party
- disloyally
less formal; focuses on failing to support someone rather than actively harming them
- faithlessly
rare and literary; describes breaking a promise or commitment
- deceitfully
broader meaning; includes lying and trickery, not only betrayal of loyalty
- loyally
direct opposite; acting with consistent support and faithfulness
- faithfully
emphasises keeping promises and honouring commitments
文法句型
verb + perfidiously
perfidiously + verb
用法筆記
Typically modifies verbs of communication or agreement (acted, spoke, revealed, betrayed, abandoned). Frequently appears in formal writing, literary texts, or historical accounts of political betrayal. Not used in everyday casual conversation.