Source : Webster's Revised Unabridged Dictionary (1913)

Niggle \Nig"gle\, v. t.
   1. To trifle or play.

            Take heed, daughter, You niggle not with your
            conscience and religion.              --Massinger.

   2. To act or walk mincingly. [Prov. Eng.]

   3. To fret and snarl about trifles. [Prov. Eng.]

Niggle \Nig"gle\, v. t. [imp. & p. p. {Niggled}; p. pr. & vb. n.
   {Niggling}.] [Dim. of Prov. E. nig to clip money; cf. also
   Prov. E. nig a small piece.]
   To trifle with; to deceive; to mock. [Obs.] --Beau. & Fl.

Niggle \Nig"gle\, v. t.
   1. To use, spend, or do in a petty or trifling manner.

   2. To elaborate excessively, as in art.

Niggle \Nig"gle\, v. i. (Chiefly Eng.)
   1. To move about restlessly or without result; to fidget.

   2. To be finicky or excessively critical; to potter; esp., to
      work with excessive care for trifling details, as in
      painting.

Source : WordNet®

niggle
     v 1: worry unnecessarily or excessively; "don't fuss too much
          over the grandchildren--they are quite big now" [syn: {fuss},
           {fret}]
     2: argue over petty things; "Let's not quibble over pennies"
        [syn: {quibble}, {pettifog}, {bicker}, {squabble}, {brabble}]