English
seethingly
From seething + -ly.
Formed from seething + -ly
Proto-Indo-European *h₂sewt- ‘to move about, roil, seethe’
Proto-Germanic *seuþaną ‘to seethe’
Old English sēoþan ‘to cook’
Middle English sethen ‘to boil food or meat as to cook or prepare it’
Middle English sethyng ‘Boiling for the purpose of heating or warming…’
English seething
Today it means
adv In a seething manner.
Sources
Sources: Wiktionary, “seethingly”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.
Etymograph / seethingly