noun

impulse

IM-puls/ˈɪmpʌls/

A sudden urge to do something.

The shopper reaches for a treat on impulse.

A shopper suddenly reaches for a bright treat at checkout, spontaneous urge.
Etymology

A physical push became an inner stimulus that suddenly presses someone toward action.

More examples

  • He resists the impulse to interrupt.
  • On impulse, she takes a different route home.

Forms

impulse

Similar words

urge
A strong desire that need not be sudden.
whim
A passing wish, often with little serious purpose.