Learner's definition of SLIPPERY
[also more slippery; most slippery]
difficult to stand on, move on, or hold because of being smooth, wet, icy, etc.
The trails were muddy and slippery.
The floor looks slippery.
Fish are slippery to hold.
The sign cautions: “Slippery when wet.”
not easy to understand or identify in an exact way
not able to be trusted