"Well, "slithy" means "lithe and slimy." "Lithe" is the same as "active." You see it's like a portmanteau - there are two meanings packed up into one word."

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Teamwork," Koteks snarled, "is one word for it, yeah. What it really is is a way to avoid responsibility. It's a symptom of the gutlessness of the whole society.

— Thomas Pynchon