The Collaborative International Dictionary of English v.0.48:

Thunder \Thun"der\, v. i. [imp. & p. p. Thundered; p. pr. &
   vb. n. Thundering.] [AS. [thorn]unrian. See Thunder, n.]
   1. To produce thunder; to sound, rattle, or roar, as a
      discharge of atmospheric electricity; -- often used
      impersonally; as, it thundered continuously.
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            Canst thou thunder with a voice like him? --Job xl.
                                                  9.
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   2. Fig.: To make a loud noise; esp. a heavy sound, of some
      continuance.
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            His dreadful voice no more
            Would thunder in my ears.             --Milton.
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   3. To utter violent denunciation.
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The Collaborative International Dictionary of English v.0.48:

Thundering \Thun"der*ing\, a.
   1. Emitting thunder.
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            Roll the thundering chariot o'er the ground. --J.
                                                  Trumbull.
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   2. Very great; -- often adverbially. [Slang]
      [1913 Webster] -- Thun"der*ing*ly, adv.
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The Collaborative International Dictionary of English v.0.48:

Thundering \Thun"der*ing\, n.
   Thunder. --Rev. iv. 5.
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WordNet (r) 3.0 (2006):

thundering
    adj 1: sounding like thunder; "the thundering herd"
    2: extraordinarily big or impressive; "a thundering success";
       "the thundering silence of what was left unsaid"

Moby Thesaurus II by Grady Ward, 1.0:

85 Moby Thesaurus words for "thundering":
   Donar, Indra, Jupiter Tonans, Thor, anathema, ban, banging,
   blasphemy, boom, booming, bumping, cannonading, commination, curse,
   damnation, deafening, deep, denunciation, dread rattling thunder,
   echo, echoic, echoing, evil eye, excommunication, execration,
   fulminating, fulmination, growl, growling, grumble, grumbling, hex,
   imprecation, intense, lingering, loud, malison, malocchio,
   peal of thunder, pealing, penetrating, persistent, piercing,
   proscription, pungent, reboant, reboation, rebound, rebounding,
   reecho, reechoing, reeking, repercussive, resound, resounding,
   reverberant, reverberating, reverberation, reverberatory, roaring,
   rolling, rumble, rumbling, slapping, sounding, spanking, thumping,
   thunder, thunderclap, thundercrack, thunderlike, thunderous,
   thunderpeal, thunderstorm, thunderstroke, thundery, tonitruant,
   tonitruous, undamped, volleying, walloping, whacking, whaling,
   whammy, whopping