barren mountain; treeless mountain
Refers to a mountain with sparse vegetation, often due to poor soil or erosion. Not a common everyday word, but understandable.
There are hardly any trees growing on the barren mountain.
Compound of 痩せ (yase, 'thin, lean') and 山 (yama, 'mountain'), literally 'thin mountain'. The exact historical derivation is uncertain, but the spelling is conventionally associated with the meaning of a barren or treeless mountain.