English mountainous

← English mountain (affix)

← English -ous (affix)

← Middle French montagneux (borrowed)

← Middle French montaigne (mention)

← Latin montānus (derived)

→ English mountainously (suffix)

→ English nonmountainous (prefix)

→ English mountainousness (suffix)

→ English unmountainous (prefix)

→ English intramountainous (prefix)

→ Spanish montañoso (cognate)