adjective
slippery
SLIP-uh-ree/ˈslɪpəri/
Difficult to grip because of a tendency to slide.
A woman struggles to keep her balance on the slippery tiles.

Etymology
Slipor already described a smooth surface that offered no firm footing or hold. The added -y reinforced an existing adjective, so the word describes a surface's tendency to let feet or objects slide.
In context
if your rock is submerged in the water be careful that's where they're most likely to be slippery and you can lose your footing
More examples
- The wet soap is too slippery to hold.
- Watch your step on the slippery stairs.
- Rain makes the wooden bridge even slipperier.
Forms
slippery · slipperier · slipperiest
slipperiness noun — The quality of being hard to grip.
Similar words
- slick
- Usually describes a smooth surface made slippery by liquid.
- greasy
- Specifically describes slipperiness caused by oil or fat.