The Collaborative International Dictionary of English v.0.48:

Snivel \Sniv"el\, v. i. [imp. & p. p. Sniveledor Snivelled;
   p. pr. & vb. n. Sniveling or Snivelling.] [OE. snivelen,
   snevelen, snuvelen, freg. of sneven. See Sniff, and cf.
   Snuffle.]
   1. To run at the nose; to make a snuffling noise.
      [1913 Webster]

   2. To cry or whine with snuffling, as children; to cry weakly
      or whiningly.
      [1913 Webster]

            Put stop to thy sniveling ditty.      --Sir W.
                                                  Scott.
      [1913 Webster]

WordNet (r) 3.0 (2006):

sniveling
    n 1: whining in a tearful manner [syn: snivel, sniveling]

Moby Thesaurus II by Grady Ward, 1.0:

76 Moby Thesaurus words for "sniveling":
   Tartuffian, Tartuffish, abject, affected, backscratching, bawling,
   beggarly, blubbering, bootlicking, canting, cowering, crawling,
   cringing, crouching, cry, crying, dissolved in tears, false,
   fawning, fit of crying, flattering, flood of tears, footlicking,
   good cry, goody, goody-goody, greet, groveling, hangdog,
   holier-than-thou, hypocritical, in tears, ingratiating, insincere,
   lachryma, lachrymal, lachrymose, lachrymosity, lacrimatory,
   mealymouthed, melting mood, obeisant, obsequious, on bended knee,
   overflowing eyes, parasitic, pharisaic, pietistic, pious,
   prostrate, ready to cry, sanctified, sanctimonious, self-righteous,
   sobbing, sponging, sycophantic, tear, tear bottle, teardrop,
   tearful, tearful eyes, tearfulness, tears, teary, timeserving,
   toadeating, toadying, toadyish, truckling, unctuous, weepiness,
   weeping, weepy, whimpering, with eyes suffused