Main entry: slippery, slippy
Definition: causing or tending to cause things to slip or slide
Usage: slippery sidewalks; a slippery bar of soap; the streets are still slippy from the rain
Antonyms: nonslippery
Definition: not slippery; not likely to slip or skid
Main entry: tricky, slippery
Definition: not to be trusted
Usage: how extraordinarily slippery a liar the camera is- James Agee
Antonyms: trustworthy, trusty
Definition: worthy of trust or belief