unmetric en · ADJ
Etymology
From un- + metric.
Meanings
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(not-comparable) Not according to the metric system.
Monsieur Hospitalier also remarked that (in France) it was customary to employ, in certain computations, unmetric units which complicate the work.
1897, American Chamber of Commerce in France, Bulletin (issues 3-43, page 13)[…] one who uses those [coins] of France, which are unmetric and under the condemnation of the men of science not only of the United States and England but of France and the entire continent.
1870, The Congressional Globe, page 283: