As an adjective slinkier
is comparative of slinky.
As a noun slinkies is
plural of slinky.
slinkier
English
Adjective
(head)
(slinky)
slinky
English
Adjective
(er)
furtive, stealthy or catlike
(UK, dialect, dated) thin; lank
Noun
(slinkies)
(mathematics) A three-dimensional curve — a spiral wound around a helix.