Etymology
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lank (adj.)

Old English hlanc "loose and empty, meagerly slim, flaccid," from Proto-Germanic *hlanka-, forming words meaning "to bend, turn," perhaps from PIE root *kleng- "to bend, turn," with a connecting notion of "flexible" (compare German lenken "to bend, turn aside;" see flank (n.)). In Middle English, "Some examples may be long adj. with unvoicing of g" [The Middle English Compendium]. In reference to hair, "straight and flat," from 1680s. Related: Lankness (1640s).

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Definitions of lank

lank (adj.)
long and thin and often limp;
grown lank with fasting
lank mousy hair
lank (adj.)
long and lean;
Synonyms: spindly
From wordnet.princeton.edu