krušný

Etymology 1
The adjective, suffixed with is derived from, which is from. This was probably derived from ("piece, fragment"), but the reverse way is also possible.

Adjective

 * 1)  hard,  strenuous,  grim

Etymology 2
The adjective is derived from, derived from.

Adjective

 * 1)  connected with ore

Usage notes
Nowadays the adjective is used in this sense only in the name Krušné hory (Ore Mountains).