They attacked him in various ways—with barefaced questions, ingenious suppositions, and distant surmises; but he eluded the skill of them all, and they were at last obliged to accept the second-hand intelligence of their neighbour, Lady Lucas.
"That is not an unnatural surmise," said Fitzwilliam, "but it is a lessening of the honour of my cousin’s triumph very sadly."
This part of his intelligence, though unheard by Lydia, was caught by Elizabeth, and, as it assured her that Darcy was not less answerable for Wickham’s absence than if her first surmise had been just, every feeling of displeasure against the former was so sharpened by immediate disappointment, that she could hardly reply with tolerable civility to the polite inquiries which he directly afterwards approached to make.
There are no more uses of "surmise" in the book.
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He has surmised that this is not a friendly visit.
Colleen Hoover -- Slammed
After texting his mom, he started the truck and peeled out of the parking lot, making it back to the ranch a little after four a.m. Seeing the lights on in the main house, he surmised that his mom had either risen early or. more likely, hadn’t gone to bed.