as in infidelity
lack of faithfulness especially to one's husband or wife
perfidiousness eventually led to the couple's divorce
Synonyms & Similar Words
Relevance
Antonyms & Near Antonyms
Example Sentences
Recent Examples of Synonyms for perfidiousness
Noun
-
Kristy alleged infidelity as the reason for the pair’s split, per court records previously obtained by PEOPLE.—
Zoey Lyttle,
PEOPLE,
27 Jan. 2026 -
An attorney retained by Andrew’s family told ABC7 that moments before the killing, Andrew read a diary entry in which his wife described engaging in infidelity.—
Clara Harter,
Los Angeles Times,
24 Jan. 2026
Noun
-
The book presents itself as a comic take on the classic adultery novel and a send-up of a narrow, self-conscious group of downwardly mobile New Yorkers.—
Literary Hub,
Literary Hub,
8 Jan. 2026
-
The initial batch of documents showed that Angela Paxton sought the divorce on the grounds that Ken Paxton had committed adultery, but included no additional details.—
S.E. Jenkins,
CBS News,
19 Dec. 2025
Noun
-
And in the scenario, guilt acts the emergency brake system and keeps you loyal to an outdated self story by framing change as betrayal.—
Mark Travers,
Forbes.com,
22 Jan. 2026
-
The story is set in the mid-2000s and centers on betrayal, both personal and political, culminating in a plot to assassinate late North Korean leader Kim Jong Il – father of current leader Kim Jong Un – by blowing up his train.—
Will Ripley,
CNN Money,
21 Jan. 2026
Noun
-
More recently, an al Qaeda operative and suspected mastermind behind the 2000 USS Cole bombing — in which suicide bombers sidled up alongside a US warship, waved to the sailors and then detonated explosives — was charged with perfidy, among other crimes.—
Harmeet Kaur,
CNN Money,
21 Jan. 2026
-
The report has raised concerns of perfidy, an act of deception by military forces.—
Jenna Prestininzi,
Freep.com,
13 Jan. 2026
Noun
-
Research on group dynamics shows that dissent is often interpreted as disloyalty rather than contribution.—
Benjamin Laker,
Forbes.com,
16 Jan. 2026
-
The courts have warned against treating dissent as disloyalty.—
Chicago Tribune,
Chicago Tribune,
12 Jan. 2026
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Cite this Entry
“Perfidiousness.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/perfidiousness. Accessed 29 Jan. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
