10 letters · 14 points in Scrabble
adjective loud enough to cause (temporary) hearing loss
adjective extremely ominous
originEtymology tree English thunder Proto-Indo-European *h₃ed- Proto-Indo-European *-os Proto-Indo-European *h₃édosder.? Proto-Italic *-ōtsos or *-otsos Latin -ōsus Old French -usbor. Middle English -ous English -ous English thunderous From thunder + -ous.
Etymology from Wiktionary, CC BY-SA 3.0