Where does “perilously” come from?

Perilously comes from Middle English perilously, formed with the Middle English adverbial suffix -ly from Old English -līċ, ultimately deriving from Latin periculosus, meaning dangerous or hazardous, built from the root per- and the Latin suffix -osus.

perilously (English): In a perilous manner

Definitions

  1. In a perilous manner

Ancestry of “perilously”, step by step

perilously traces back through two separate lines of ancestry.

via English perilous

StepLanguageWordMeaning
1EnglishperilousDangerous, full of peril
2Middle EnglishperilousFull of danger or peril; dangerous, harmful,...
3Old Frenchperilleusperilous; very dangerous
4Latinpericulosusdangerous, hazardous, perilous
5Latin-ōsusose, -ous, -ful (full of or overly prone to)
6Old Latin-ōssus

via Middle English perilously

StepLanguageWordMeaning
1Middle EnglishperilouslyIn a way that is full of peril; harmfully,...
2Middle English-lyAlternative form of -liche
3Old English-līċsuffix forming {{glossary|adjective}}s meaning...
4Proto-Germanic*-līk
Every word from Old Latin -ōssus
perilously — Etymology, Origin & Word History | Etymology Explorer