The term 'most slippery' can be described in three different ways: eeliest (7 letters), wiliest (7 letters), and iciest (6 letters). Eeliest is an adjective that describes something as being similar to an eel, which is a long, snake-like fish known for its smooth, slimy skin. Wiliest is an adjective that describes something as being crafty or cunning, like a sly fox. Lastly, iciest is an adjective that describes something as being extremely cold, like a block of ice. All three words can be used to describe something as being slippery.