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Adjective: mountainous  mawn-t(i-)nus
  1. Having hills and crags
    "mountainous terrain";
    - cragged, craggy, hilly
  2. Like a mountain in size and impressiveness
    "mountainous waves"; "a mountainous dark man"
  3. Containing many mountains

See also: big, highland, large, rough, unsmooth, upland

Encyclopedia: Mountainous