English
acidly
From acid + -ly.
A compound of acid + -ly
Proto-Indo-European *h₂eḱ- ‘sharp’
…
Proto-Italic *akēō
Latin aceō ‘to be sour’
Latin acidus ‘sour’
French acide ‘acid’
English acid
Today it means
adv sourly; tartly
Language periods are conventional ranges, not dates for this word.
Etymograph / acidly