When Mr. Zucker, head of NBC, accused the head of FOX of copying their TV show ideas -- which really isn't that hard these days, when you don't use writers -- a representative from FOX had this misplaced adjective to describe the comment:

"Unacceptable."

Unacceptable? How can you label a criticism against you "unacceptable?" I think she meant "Nonsense!" "Outrageous!" Or even the venerable "Poppycock!"

"Inconceivable!" would work.