surmise

SURMISE, v.t. surmi'ze. To suspect; to imagine without certain knowledge; to entertain thoughts that something does or will exist, but upon slight evidence.

It wafted nearer yet, and then she knew

That what before she but surmis'd, was true.

This change was not wrought by altering the form or position of the earth, as was surmised by a very learned man, but by dissolving it.