vuorinen
vuoristoinen
jättiläismäinen
järkälemäinen, vuorenkokoinen, jättimäinen
visainen
Having many mountains; characterized by mountains; of the nature of a mountain; rough (terrain); rocky.
(RQ:Cheyne Philosophical Principles)
Resembling a mountain, especially in size; huge; towering.
(quote-journal)
Very difficult.
Inhabiting mountains; (n-g) barbarous.