Definitions for unplayable
Random House Webster's College Dictionary
not capable of or suitable for being played or played on
"the golf ball was in an unplayable lie"; "the field was unplayable"; "some music seems almost unplayable"
Unable to be played on specified equipment, or at all.
Impossible to play or to defend against.
That cannot be played, or is so tedious, complicated, etc. as to preclude playing.