treacherously C2 Topic:Describing Qualities Freq #84994 Meanings 1 adv In a way that betrays trust; disloyally and deceitfully. He acted treacherously, selling his country's secrets to the enemy. Thesaurus Synonyms 1 adv · in a way that betrays... disloyallyfalselyperfidiouslytraitorouslytreasonably ↔ Opposites faithfullyloyally Etymology AI details From treacherous + -ly. Topics Describing Qualities Word Formation & Derivatives External links Cambridge Dictionary Wiktionary Google Images # treacherously **Type:** Word **Level:** C2 **Part of speech:** adv **Frequency rank:** 84994 ## Meanings 1. In a way that betrays trust; disloyally and deceitfully. ## Examples - He acted treacherously, selling his country's secrets to the enemy. ## Antonyms - faithfully - loyally ## Etymology From treacherous + -ly. ## AI Etymology Treacherously is formed from treacherous + -ly. The analysis is mainly morphological: the modern adverbial form is built from the named base and affix. Current senses include in a way that betrays trust; disloyally and deceitfully. ## Topics - Describing Qualities - Word Formation & Derivatives markdown