Adjective niggling has 1 sense
  1. fiddling, footling, lilliputian, little, Mickey Mouse, niggling, piddling, piffling, petty, picayune, trivial - (informal terms) small and of little importance; "a fiddling sum of money"; "a footling gesture"; "our worries are lilliputian compared with those of countries that are at war"; "a little (or small) matter"; "Mickey Mouse regulations"; "a dispute over niggling details"; "limited to petty enterprises"; "piffling efforts"; "giving a police officer a free meal may be against the law, but it seems to be a picayune infraction"
    Antonyms: important, of import (indirect, via unimportant)
,Verb niggle has 2 senses
  1. fuss, niggle, fret - worry unnecessarily or excessively; "don't fuss too much over the grandchildren--they are quite big now"
    --1 is one way to worry
    Sample sentence:
    Sam and Sue niggle over the results of the experiment
  2. quibble, niggle, pettifog, bicker, squabble, brabble - argue over petty things; "Let's not quibble over pennies"
    --2 is one way to argue, contend, debate, fence
    Derived form: noun niggler1
    Sample sentences:
    Somebody ----s
    Somebody ----s PP
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