slippery as an eel

Adjective

colloquial not-comparable idiomatic

(simile, colloquial) So slippery that it is almost impossible to hold. / (idiomatic, simile, colloquial) Very crafty or cunning.

Japanese Meaning

非常に滑りやすく、手中に収めるのがほぼ不可能な状態を比喩的に表す / 非常にずる賢い、狡猾な様子を比喩的に表す

The glass bottle, slippery as an eel, slipped from her fingers and shattered on the pavement.

そのガラス瓶は、うなぎのようにつるつるしていて彼女の指から滑り落ち、歩道で割れてしまった。

Sense（1）

(simile, colloquial) So slippery that it is almost impossible to hold.

Sense（2）

(idiomatic, simile, colloquial) Very crafty or cunning.

as slippery as an eel

（ canonical ）