[{"Bold_text": "noun", "List Items": ["the influence of a particular feeling, mental state, etc.:to act under a generous impulse; to strike out at someone from an impulse.", "sudden, involuntary inclination prompting to action:to be swayed by impulse.", "an instance of this.", "a psychic drive or instinctual urge.", "an impelling or force, driving onward or inducing motion.", "the effect of an impelling ; motion induced; impetus given.", "Physiology.a progressive wave of excitation over a nerve or muscle fiber, having either a stimulating or inhibitory effect.", "Mechanics.the product of the average force acting upon a body and the time during which it acts, equivalent to the change in the momentum of the body produced by such a force.", "Electricity.a single, usually sudden, flow of current in one direction."]}, {"Bold_text": "adjective", "List Items": ["marked by or acting on impulse:an impulse buyer.", "bought or acquired on impulse:To reduce expenses, shun impulse items when shopping."]}]