slinky

adjective3

1. •
   Furtive, stealthy or catlike.

   • “But of all the awful, second-rate girls I ever met, she’s the worst! […] She’s a sly, creepy, slinky, made-up, insincere vampire! She’s common! She’s awful! She’s a cat!” — 1920
2. •
   Of a garment: close-fitting; clingy.
3. •
   (old-fashioned) Thin; lank; lean.

noun1

1. •
   A toy in the form of a loose metal (originally) or plastic spring that can be made to "walk" down stairs as its coils separate and close up.