<p><strong>Verb:</strong></p><ul><li>To criticize, especially constantly or repeatedly, in a peevish or petty way; carp.</li><li>To niggle about the fine points of interpretation; preferring to niggle rather than take steps to correct a situation.</li><li>To spend too much time and effort on inconsequential details: It's difficult to be meticulous and not niggle.</li><li>To work ineffectively; trifle: to niggle with an uninteresting task.</li></ul>