Not standard; not at standard, or at a level other than that which is considered standard
Similarly, to take twenty-five years of free-form, cross-cutting social, political, economic, and historical writing growing out of work at a single, unstandard, American institution and isolate it as an "era" in such writing — a stage, a phase, a line of thought — is to pursue an agenda, take a position, state a case.
From un- + standard.
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