- to criticize, especially constantly or repeatedly, in a peevish or petty way; carp: to niggle about the fine points of interpretation; preferring to niggle rather than take steps to correct a situation.
- to spend too much time and effort on inconsequential details: It's difficult to be meticulous and not niggle.
- to work ineffectively; trifle: to niggle with an uninteresting task.
- to find fault continually
- to be preoccupied with details; fuss
- to irritate; worry
- a slight or trivial objection or complaint
- a slight feeling as of misgiving, uncertainty, etc
