The Collaborative International Dictionary of English v.0.48:

Languish \Lan"guish\, v. i.
   To cause to droop or pine. [Obs.] --Shak. --Dryden.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Languish \Lan"guish\, n.
   See Languishment. [Obs. or Poetic]
   [1913 Webster]

         What, of death, too,
         That rids our dogs of languish?          --Shak.
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         And the blue languish of soft Allia's eye. --Pope.
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The Collaborative International Dictionary of English v.0.48:

Languish \Lan"guish\, v. i. [imp. & p. p. Languished; p. pr. &
   vb. n. Languishing.] [OE. languishen, languissen, F.
   languir, L. languere; cf. Gr. ? to slacken, ? slack, Icel.
   lakra to lag behind; prob. akin to E. lag, lax, and perh. to
   E. slack. See -ish.]
   1. To become languid or weak; to lose strength or animation;
      to be or become dull, feeble or spiritless; to pine away;
      to linger in a weak or deteriorating condition; to wither
      or fade.
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            We . . . do languish of such diseases. --2 Esdras
                                                  viii. 31.
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            Cease, fond nature, cease thy strife,
            And let me languish into life.        --Pope.
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            For the fields of Heshbon languish.   --Is. xvi. 8.
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   2. To assume an expression of weariness or tender grief,
      appealing for sympathy. --Tennyson.

   3. To be neglected and unattended to; as, the proposal
      languished on the director's desk for months.
      [PJC]

   Syn: To pine; wither; fade; droop; faint.
        [1913 Webster]

WordNet (r) 3.0 (2006):

languish
    v 1: lose vigor, health, or flesh, as through grief; "After her
         husband died, she just pined away" [syn: pine away,
         waste, languish]
    2: have a desire for something or someone who is not present;
       "She ached for a cigarette"; "I am pining for my lover" [syn:
       ache, yearn, yen, pine, languish]
    3: become feeble; "The prisoner has be languishing for years in
       the dungeon" [syn: languish, fade]