slinkier; slinkiest
Definition of slinky
1
: characterized by slinking : stealthily quiet
slinky movements
2
: sleek and sinuous in movement or outline
especially
: following the lines of the figure in a gracefully flowing manner
a slinky evening gown
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Merriam-Webster unabridged
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Time Traveler for slinky
The first known use of slinky was in 1918
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