Where does “viciously” come from?

Viciously comes from Middle English viciously, formed from Middle English -ly added to Latin vitiosus meaning "full of vice," which combines Latin -osus with a root from Proto-Indo-European.

viciously (English): In a vicious manner; ferociously or maliciously

Definitions

  1. In a vicious manner; ferociously or maliciously

Ancestry of “viciously”, step by step

viciously traces back through two separate lines of ancestry.

via English vicious

StepLanguageWordMeaning
1EnglishviciousViolent, destructive and cruel; Savage and...
2English-lyUsed to form adjectives from nouns, the...
3EnglishgrislyHorrifyingly repellent; gruesome, terrifying;...
4Middle Englishgrisely
5Old Englishgrisliċgrisly, horrible; dreadful, horrid
6Old English-līċsuffix forming {{glossary|adjective}}s meaning...
7Proto-Germanic*-līk

via Middle English viciously

StepLanguageWordMeaning
1Middle Englishviciouslysinfully, evilly
Every word from Proto-Germanic *-līk
viciously — Etymology, Origin & Word History | Etymology Explorer