weaselly

[wee-zuh-lee]

adjective

resembling a weasel, especially in features or manner: a weaselly little clerk with furtive eyes.

Origin of weaselly

First recorded in 1830–40; weasel + -y¹

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

I thought being a 4-F was a kind of weaselly thing to do, but I couldn't control that.
My Conversation with John Updike
Barbara Probst Solomon
January 29, 2009

Next her eyes scanned Quisanté's face; he was not weaselly now, nor ostentatious.
Quisant
Anthony Hope