Weening:
archaic
: to hold as an opinion : SUPPOSE, BELIEVE
Little did he ween that these wretched rags he now wore, were but suitable to that long career of destitution before him … Herman Melville
Since primal Man was fashioned / To people ice and stones, / No pair, I ween, had ever been / Such chums as I and JONES. P. G. Wodehouse [Merriam-Webster]
No, no sightings. The word overweening, meaning arrogant, had occurred to me yesterday as a bit of verbiage I hardly ever encounter on the Web, and, as it seemed likely to be a word constructed from others, I then wondered as to the meanings of weening.
I have read Melville, and I have the bloodstains to prove it. While I enjoyed Moby-Dick, at the end of Pierre I seriously considered clawing out my eyes.