Definitions of mountainous
  1. adjective
    containing many mountains
    highland, upland
    used of high or hilly country
  2. adjective
    having hills and crags
    synonyms: cragged, craggy, hilly
    rough, unsmooth
    having or caused by an irregular surface
  3. adjective
    like a mountain in size and impressiveness
    mountainous waves”
    “a mountainous dark man”
    big, large
    above average in size or number or quantity or magnitude or extent
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