1 glassy, greasy, icy, lubricious (rare) perilous, skiddy (informal) slippy (informal or dialect) smooth, unsafe, unstable, unsteady
2 crafty, cunning, devious, dishonest, duplicitous, evasive, false, foxy, shifty, sneaky, treacherous, tricky, two-faced, unpredictable, unreliable, untrustworthy
English Collins Dictionary - English synonyms & Thesaurus
1 adj Something that is slippery is smooth, wet, or oily and is therefore difficult to walk on or to hold.
The tiled floor was wet and slippery..., Motorists were warned to beware of slippery conditions.
2 adj You can describe someone as slippery if you think that they are dishonest in a clever way and cannot be trusted., (disapproval)
He is a slippery customer, and should be carefully watched.
3 If someone is on a slippery slope, they are involved in a course of action that is difficult to stop and that will eventually lead to failure or trouble.
slippery slope phrase N inflects, usu down/on PHR, oft PHR to n
The company started down the slippery slope of believing that they knew better than the customer.
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