Impulse/ˈɪmpʌls/ Definition 1 of 4Pro Tip 1/3Emotion origin The 'impulse' to act stems from a sudden emotion rather than careful thought. Seeing the injured animal by the road, she had an impulse to help. Pro Tip 2/3Temporary feeling 'Impulse' often refers to a temporary desire that might quickly pass. He bought the expensive shoes on an impulse, but later regretted it. Pro Tip 3/3Acting without plan Acting on 'impulse' means doing something unplanned. She cut her hair on impulse and surprised everyone.