Thunderous means extremely loud and deep in sound. Thunderous applause, a thunderous roar, thunderous silence.
Thunderous applause is the fixed phrase and is the highest form of it. A thunderous expression is a different sense entirely and means a face like a storm about to break.
1adjectivethunderousExtremely loud and deep in sound.
“The waterfall made a thunderous roar that we could hear from far away.”
thunderous is a quality.
Proto-Indo-European
*(s)tenh₂-
Proto-Indo-European
*(s)ten-
Proto-Germanic
*þunraz
Proto-West Germanic
*þunr
Old English
þunor — thunder
Middle English
thunder
English
thunder
English, today
thunderous
Built from
From thunder + -ous. thunder comes from Middle English thunder, thonder, thundre, thonre, thunnere, þunre, from Old English þunor (“thunder”), from Proto-West Germanic þunr, from Proto-Germanic þunraz, from Proto-Indo-European (s)ten-, (s)tenh₂- (“to thunder”). Compare astound, astonish, stun. Germanic cognates include West Frisian tonger, Dutch donder, German Donner, Old Norse Þórr (English Thor), Danish torden, Norwegian Nynorsk tore. Other cognates include Persian تندر, Latin tonō, detonō, Ancient Greek στένω, στενάζω, στόνος, Στέντωρ, Irish torann, Welsh taran, cel-gau Taranis. a doublet of donner and Thunor and Thor.
Etymology from Wiktionary, CC BY-SA