1. in an unpredictable, inconsistent, or irregular manner

Examples

• The old car’s engine ran erratically, sometimes stalling without warning.
• She had been sleeping erratically due to stress from work.
• The stock market moved erratically throughout the day.
• His behavior became increasingly erratic after the accident.
• The wifi signal worked erratically in that part of the building.
• The patient’s heart rate was beating erratically during the procedure.