Spanish Etymology From estruendo + -oso. Pronunciation IPA(key): /estɾwenˈdoso/ [es.t̪ɾwẽn̪ˈd̪o.so] Rhymes: -oso Syllabification: es‧truen‧do‧so Adjective estruendoso (feminine estruendosa, masculine plural estruendosos, feminine plural estruendosas) thundering, clamoring, roaring, deafening (very loud) Further reading “estruendoso”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8, Royal Spanish Academy [Spanish: Real Academia Española], 2024 December 10Wikiwand - on Seamless Wikipedia browsing. On steroids.