thundering Syllabification: (thun·der·ing)Pronunciation: /ˈTHənd(ə)riNG/Translate thundering | into Italian Definition of thundering adjective [attributive] making a resounding, loud, deep noise:thundering waterfalls informal extremely great, severe, or impressive:a thundering bore [as submodifier]:a thundering good readDerivatives thunderingly adverb [as submodifier]:it was so thunderingly dullthundering in other Oxford dictionaries Definition of thundering in the British & World English dictionary