1. Worry unnecessarily or excessively
   - fuss, fret 
2. Argue over petty things
   - quibble, pettifog, bicker, squabble, brabble

Derived forms: niggled, niggling, niggles

See also: niggler

Type of: argue, contend, debate, fence, worry

Encyclopedia: Niggle

• control circuit
• control condition
• control experiment
• control freak
• control function
• control grid
• control key
• control operation
• control panel
• control rod
• control room
• control stick
• control stock
• control surface
• control system
• control tower
• controllability
• controllable
• controlled
• controlled substance
• controller
• controllership
• controlling
• controlling interest
• controversial