Longman Dictionary of Contemporary English
Wiktionary
a. 1 (context of an audio or visual recording English) Unable to be played on specified equipment, or at all. 2 (context cricket football of the delivery of a ball English) Impossible to play or to defend against. 3 (context video games English) That cannot be played, or is so tedious, complicated, buggy, etc. as to discourage or preclude playing.
WordNet
adj. 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" [ant: playable]
Usage examples of "unplayable".
The tensions in a harp are so tremendous and unrelenting that it becomes unplayable after fifty years and belongs on a dump or in a museum.
Haagedorn, left for an unfortunate moment to face the bowling, succumbed to a really nasty and almost unplayable ball which curled round his feet like a playful kitten and skittled his leg-stump.
I stalked the streets of Branning-at-sea dangling my unplayable knife, gawking at the five story buildings till I saw the buildings with twenty-five stories.