The Collaborative International Dictionary of English v.0.48:

Lithe \Lithe\ (l[imac][th]), v. t. & i. [Icel hl[=y][eth]a. See
   Listen.]
   To listen or listen to; to hearken to. [Obs.] --P. Plowman.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lithe \Lithe\, a. [AS. l[imac][eth]e, for lin[eth]e tender,
   mild, gentle; akin to G. lind, gelind, OHG. lindi, Icel.
   linr, L. lenis soft, mild, lentus flexible, and AS. linnan to
   yield. Cf. Lenient.]
   1. Mild; calm; as, lithe weather. [Obs.]
      [1913 Webster]

   2. Capable of being easily bent; pliant; flexible; limber;
      as, the elephant's lithe proboscis. --Milton.

   Syn: lithesome.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lithe \Lithe\, v. t. [AS. l[imac][eth]ian. See Lithe, a.]
   To smooth; to soften; to palliate. [Obs.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

lithe
    adj 1: moving and bending with ease [syn: lissome, lissom,
           lithe, lithesome, slender, supple, svelte,
           sylphlike]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "lithe":
   adaptable, bendable, bending, compliant, ductile, elastic,
   extensible, extensile, fabricable, facile, fictile, flexible,
   flexile, flexuous, formable, formative, giving, impressible,
   impressionable, lean, like putty, limber, lissome, lithesome,
   malleable, moldable, plastic, pliable, pliant, receptive,
   responsive, sensitive, sequacious, shapable, slender, slight, slim,
   spare, springy, submissive, supple, susceptible, thin, tractable,
   tractile, whippy, willowy, yielding



The Free On-line Dictionary of Computing (30 December 2018):

LITHE

   Object-oriented with extensible syntax.

   "LITHE: A Language Combining a Flexible Syntax and Classes",
   D. Sandberg, Conf Rec 9th Ann ACM Sym POPL, ACM 1982,
   pp.142-145.