acerbly
/əˈsəːbli/adverb
In early use: with a sour, bitter, or astringent flavour. Now chiefly: in a sharp or cutting manner; acerbically.
Origin
Late Middle English (in an earlier sense). Originally from classical Latin acerbus acerb + -ly, after classical Latin acerbē, adverb. In later use from acerb + -ly.