That cannot be watched; that does not bear watching.(adjective)
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Use "unwatchable" in a sentence
""What I find pretty much unwatchable is all the (stuff) that's on the costumes," said Jef Billings, a longtime designer who has dressed Peggy Fleming, Michelle Kwan and Sarah Hughes, as well as Canadian Jeff Buttle, the men's bronze medalist."
"So let's watch it -- not just pronounce it "unwatchable" -- and stand ready to rip Gibson apart -- if there's anything left to rip after he's gelded himself."
"The original Amityville wasn’t great, you’re right, but the remake was nearly unwatchable from the performances alone."