"... as guest at a wedding, he deduced that the bride was about to abandon her hasband-to-be and elope with a certain young man, because the latter was panting, sweating, and changing colour, the bride was fearful, and both had eyes brimming with water and a keen gaze"

Конечно, в глазах могут быть только слезы, но здесь они явно не были "полны слез" или "наполнены слезами". Да и "острого" взгляда здесь тоже не было.

Exactly, Grumbler!

Their eyes had a glass look because they were on edge and nervous about their situation, and KEEN here means "strangely transfixed" on nothing in particular - as if they didn't know where to look.

what is glass look?

sorry, GLASSY look

+++Eugene!

thank you Uly!

👍🏼 😉