slimy
adj.adj. covered in a thick, slippery liquid that feels unpleasant. It can also describe a person who seems dishonest or fake in a way that makes you feel uncomfortable.
adj. covered with or resembling a viscous, slippery substance. When applied to a person's character, it implies a combination of insincerity, sycophancy, and untrustworthiness.
The rocks by the river were very slimy and slippery.
I didn't trust the salesman because he had a slimy way of giving fake compliments.
The cave walls were coated in a thick, slimy moss that thrived in the damp darkness, making every handhold a potential hazard for the climbers.
From Middle English slymy, slimi, either derived from the Old English noun slīm or an unattested *slīmiġ, replacing Old English slipiġ (“slippy, slimy”). Equivalent to slime + -y. Cognate with Dutch slijmig, slijmerig (“slimy”), German schleimig (“slimy; smarmy”), Swedish slemmig (“slimy”).
Often used both literally for textures and figuratively for untrustworthy behavior.