Synonyms of mountainous in English:

mountainous


See definition of mountainous

adjective

1‘a mountainous region’

SYNONYMS

hilly, craggy, rocky, alpine, high, steep, precipitous

upland, highland

ANTONYMS

flat

2‘mountainous waves’

SYNONYMS

huge, enormous, gigantic, massive, very big, very large, great, giant, colossal, mammoth, vast, immense, tremendous, mighty, formidable, staggering, monumental, Herculean, epic, prodigious, monstrous, titanic, towering, king-sized, king-size, gargantuan, substantial

informal mega, monster, whopping, whopping great, thumping, thumping great, humongous, jumbo, hulking, astronomical, astronomic

British informal whacking, whacking great, ginormous

ANTONYMS

tiny, minute