Unaccountable in example sentence
She found him so perfectly indifferent, that she was almost afraid to enter into the point with him; but, however, after some other circumlocutions she told him that by a strange and unaccountable accident she came to have a particular knowledge of the late unhappy adventure he had fallen into, and that in such a manner, that there was nobody in the world but herself and him that were acquainted with it, no, not the very person that was with him.