from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Producing thunder or a similar sound.
  • adjective Loud and unrestrained in a way that suggests thunder.

from The Century Dictionary.

  • Thunder-producing; betokening thunder; awful.
  • Thundering; loud and deep-sounding; making a noise like thunder.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective rare Producing thunder.
  • adjective Making a noise like thunder; sounding loud and deep; sonorous.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Very loud; suggestive of thunder

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective loud enough to cause (temporary) hearing loss
  • adjective extremely ominous


from Wiktionary, Creative Commons Attribution/Share-Alike License

thunder +‎ -ous


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