Impulsivity is acting without planning or forethought. In psychology, impulsivity (or impulsiveness) is a tendency to act on a whim, displaying behavior characterized by little or no forethought, reflection, or consideration of the consequences.[1] Impulsive actions are typically "poorly conceived, prematurely expressed, unduly risky, or inappropriate to the situation that often result in undesirable consequences,"[2] which imperil long-term goals and strategies for success.[3] Impulsivity can be classified as a multifactorial construct.[4] A functional variety of impulsivity has also been suggested, which involves action without much forethought in appropriate situations that can and does result in desirable consequences. "When such actions have positive outcomes, they tend not to be seen as signs of impulsivity, but as indicators of boldness, quickness, spontaneity, courageousness, or unconventionality"[2][5] Thus, the construct of impulsivity includes at least two independent components: first, acting without an appropriate amount of deliberation,[2] which may or may not be functional; and second, choosing short-term gains over long-term ones.[6]
Gambling is usually a compulsivity issue, not impulsive. If an act is planned with forethought, it's not impulsive.