niggle/ˈnɪɡəl/Third PersonnigglesPresent ParticiplenigglingPast TenseniggledPast Participleniggled1to argue over an unimportant thing or criticize someone for itCopySynonyms: pettifogquibblesquabblebrabblebicker2worry unnecessarily or excessivelyCopySynonyms: fretfuss