Definition of "unclassifiable" []

• Incapable of being classified (adjective)

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• "To fulfill this requirement, in 1999 EPA will issue "unclassifiable" designations for PM 2.5."
• "It recommended that the remainder of the state be listed as either meeting the standards or "unclassifiable" due to a lack of monitoring information."
• "That album lived up to the descriptor "unclassifiable"; it is a startling amalgamation of free jazz, metal and progressive rock percolating through a dense, constantly shifting soundscape."