Where does “horribly” come from?

Horribly comes from Middle English horribly, derived from the adjective horrible meaning "causing horror or dread."

horribly (English): In a horrible way; very badly; To an extreme...

Definitions

  1. In a horrible way; very badly; To an extreme...

Ancestry of “horribly”, step by step

horribly traces back through two separate lines of ancestry.

via English horrible

StepLanguageWordMeaning
1EnglishhorribleA thing that causes horror; a terrifying thing,...
2Middle Englishhorriblehorrible
3Old Frenchhorrible
4Latinhorribilishorrible, terrible, dreadful, fearful
5Latin-bilis-ble
6Proto-Italic-ðlisForms adjectives from verb stems indicating capacity or worth of being acted on
7Proto-Indo-European-dʰlis
8Proto-Indo-European-dʰlomAlternative form of *-trom; instrumental suffix;...

via Middle English horribly

StepLanguageWordMeaning
1Middle Englishhorribly
Every word from Proto-Indo-European -dʰlomEvery word from Latin -bilisEvery word from Latin horribilis