Action under uncertainty is the fundamental premise of entrepreneurship. Impulsive individuals are attracted to uncertain contexts and more likely to act in spite of uncertainty. Thus, impulsivity may represent an asset in entrepreneurship. This paper develops detailed propositions for the multifaceted influence of impulsivity on entrepreneurial action. It moves beyond entrepreneurship as a deliberate evaluative process to sufficiently account for how uncertainty influences action. In so doing, this paper constitutes a counterweight to the extensive examinations of positive personal attributes in entrepreneurship research. It also suggests a context in which a common trait with strong negative connotations may be advantageous.