Not capable of being fixed (mended or repaired).(adjective)
Not capable of being fixed (attached).(adjective)
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Use "unfixable" in a sentence
"The Wall Street Journal noted that Alexander also said that the Waxman-Markey "unfixable" climate bill "needs to be junked.""
"A hack that's "unfixable" is a pretty bold claim, but that's just what researchers Vipin Kumar and Nitin Kumar have announced at the now-happening Hack in the Box security conference, and they seem ready to back it up."
"Bragging about an "unfixable" exploit reminds me of bragging about an unexploitable OS."