Meanings
adverbtreacherously (comparative more treacherously, superlative most treacherously)
comparative more treacherously · superlative most treacherously
- In a treacherous manner.
The former spy behaved treacherously.
Synonyms: dastardly, traitorly, traitorwise, dastardly, disloyally, false, falsely, Judasly
Synonyms & antonyms
adverbIn a treacherous manner.
Opposite
More synonyms by meaning
adverbin a disloyal and faithless manner
Also see
Synonym sets from Open English WordNet, CC BY 4.0.
Origin
Translations
Finnish kavalasti, petollisesti
- kavalastiin a treacherous manner
- petollisestiin a treacherous manner
French traîtreusement
- traîtreusementin a treacherous manner
Italian proditoriamente, subdolamente
- proditoriamentein a treacherous manner
- subdolamentein a treacherous manner
Portuguese traiçoeiramente
- traiçoeiramentein a treacherous manner
Spanish traidoramente
- traidoramentein a treacherous manner
Swedish förrädiskt
- förrädisktin a treacherous manner
Cite this entry
APA
treacherously. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/treacherously
MLA
“treacherously.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/treacherously. Accessed November 2, 2026.
Chicago
WatkinsX Dictionary, s.v. “treacherously,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/treacherously.
Source: treacherously on Wiktionary, CC BY-SA 4.0.