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"unspectacular," 1909 in a literal sense, in reference to material yielded by a mill, etc., before sorting for quality (cf. common run "usual, ordinary type," from 1712). Figurative use is from 1922.
Common, ordinary, average: “His performance in the game was neither exemplary nor disastrous; it was simply run of the mill.”
Ordinary; average; garden-variety (1930+)