Antonyms of adj mountainous

3 senses of mountainous

Sense 1
cragged, craggy, hilly, mountainous -- (having hills and crags; "hilly terrain")

INDIRECT (VIA rough) -> smooth -- (having a surface free from roughness or bumps or ridges or irregularities; "smooth skin"; "a smooth tabletop"; "smooth fabric"; "a smooth road"; "water as smooth as a mirror")

Sense 2
mountainous -- (like a mountain in size and impressiveness; "mountainous waves"; "a mountainous dark man")

INDIRECT (VIA large, big) -> small, little -- (limited or below average in number or quantity or magnitude or extent; "a little dining room"; "a little house"; "a small car"; "a little (or small) group")
INDIRECT (VIA large, big) -> small, little -- (limited or below average in number or quantity or magnitude or extent; "a little dining room"; "a little house"; "a small car"; "a little (or small) group")

Sense 3
mountainous -- (containing many mountains)

INDIRECT (VIA upland) -> lowland -- (of relatively low or level country)

Similarity of adj mountainous

3 senses of mountainous

Sense 1
cragged, craggy, hilly, mountainous -- (having hills and crags; "hilly terrain")
       => rough (vs. smooth), unsmooth -- (having or caused by an irregular surface; "trees with rough bark"; "rough ground"; "rough skin"; "rough blankets"; "his unsmooth face")

Sense 2
mountainous -- (like a mountain in size and impressiveness; "mountainous waves"; "a mountainous dark man")
       => large (vs. small), big (vs. little) -- (above average in size or number or quantity or magnitude or extent; "a large city"; "set out for the big city"; "a large sum"; "a big (or large) barn"; "a large family"; "big businesses"; "a big expenditure"; "a large number of newspapers"; "a big group of scientists"; "large areas of the world")

Sense 3
mountainous -- (containing many mountains)
       => upland (vs. lowland), highland (prenominal) -- (used of high or hilly country)