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Definition of Slippery as an eel
1. Adjective. (simile colloquial) So slippery that it is almost impossible to hold with one's hands ¹
2. Adjective. (idiomatic simile colloquial) (of a person) So crafty, or cunning that they cannot be caught by the police, although it is known that they are acting illegally. ¹
¹ Source: wiktionary.com