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comparative more unaccountably, superlative most unaccountably
Not able to be explained logically. Without being accountable, or reasonable. quotations examples
The number 392, very unaccountably, was never filled, and two of the sets of parts never appear to have been assembled at all, and were presumably kept as spares.
1944 May and June, “Notes and News: Maunsell Moguls in Ireland”, in Railway Magazine, page 186