Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Origin: slipper 'slippery' (11-19 centuries), from Old English slipor

slippery

adjective
     
slip‧per‧y
1 something that is slippery is difficult to hold, walk on etc because it is wet or greasy:
In places, the path can be wet and slippery.
Harry's palms were slippery with sweat.
2 informal someone who is slippery cannot be trusted:
Martin is a slippery customer (=someone you should not trust) so be careful what you say to him.
3 not having one clear meaning and able to be understood in different ways:
the slippery notion of 'standards'
4

(be on) a/the slippery slope

British English informal used to talk about a process or habit that is difficult to stop and which will develop into something extremely bad
(be on) a/the slippery slope to/towards
He is on the slippery slope to a life in crime.
slipperiness noun [uncountable]

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