Source : Webster's Revised Unabridged Dictionary (1913)

Snuffle \Snuf"fle\, v. i. [imp. & p. p. {Snuffled}; p. pr. & vb.
   n. {Snuffling}.] [Freq. of snuff, v.i.; akin to LG. snuffeln,
   G. schn["u]ffeln, D. snuffeln, Dan. sn["o]vle. Cf.
   {Sniffle}.]
   To speak through the nose; to breathe through the nose when
   it is obstructed, so as to make a broken sound.

         One clad in purple Eats, and recites some lamentable
         rhyme . . . Snuffling at nose, and croaking in his
         throat.                                  --Dryden.

Source : WordNet®

snuffling
     adj : liable to sniffle [syn: {sniffly}, {snuffly}]