Definition of “slippery” - English Dictionary

british dictionary

“slippery” in British English

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uk /ˈslɪp.ər.i/ us /ˈslɪp.ɚ.i/

C1 If something is slippery, it is wet or smooth so that it slides easily or causes something to slide:

slippery soap
a slippery floor
The road was wet and slippery.

informal disapproving Someone who is slippery cannot be trusted:

He's as slippery as an eel - you can never get a straight answer out of him.
He's a slippery customer (= person), and I've never felt comfortable with him.

(Definition of “slippery” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“slippery” in American English

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us /ˈslɪp·ə·ri/

sliding easily or causing something to slide because of being wet, smooth, or oily:

The sidewalks were slippery with ice.

Slippery also means not certain:

Choosing the perfect juror can be a slippery matter.

infml A person who is slippery is someone you feel you cannot trust:

He is a slippery fellow, full of schemes.

(Definition of “slippery” from the Cambridge Academic Content Dictionary © Cambridge University Press)