I. ˈthənd(ə)riŋ, -rēŋ noun
( -s )
Etymology: Middle English thondring, from Old English thunring, from thunrian to thunder + -ing
: thunder
II. adjective
Etymology: from present participle of thunder (II)
: awesome in virtue of impressive greatness, magnitude, or unusualness
the thundering silence of what was left unsaid — A.E.Stevenson b.1900
a thundering success as a salesman — R.H.Rovere
• thun·der·ing·ly adverb