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comparative more inexplicable, superlative most inexplicable
Impossible to explain; not easily accounted for. quotations examples
The year 1866 was signalised by a remarkable incident, a mysterious and inexplicable phenomenon, which doubtless no one has yet forgotten.
1873, Jules Verne, chapter I, in [anonymous], transl., Twenty Thousand Leagues under the Seas; […], James R. Osgood edition, Boston, Mass.: Geo[rge] M[urray] Smith & Co., part I, page 3