unfeasibility

Unfeasibility is the state or condition of being not feasible; the lack of practicality or viability of a plan, proposal, or method under specified conditions. In ordinary use, it denotes that achieving an objective is not feasible given resources, constraints, or other requirements.

In many contexts, unfeasibility is discussed alongside feasibility. The term is often used interchangeably with infeasibility; however, some writers reserve infeasibility for more formal technical assessments. Both terms refer to the inability to satisfy criteria necessary for implementation.

Assessments of unfeasibility typically examine technical, economic, legal, operational, and schedule factors. A feasibility study or cost-benefit analysis may identify unfeasibility by showing insufficient funds, prohibitive risk, regulatory barriers, or insurmountable technical challenges.

Implications include reconsidering scope, seeking alternatives, or postponing a project. For example, a construction plan might be deemed unfeasible due to budget gaps and environmental restrictions; a software project might be unfeasible because of integration complexity and timeline constraints.

Etymology and related terms: unfeasibility is formed with the prefix un- and the noun feasible; related terms include infeasibility, impracticability, and impossibility. In practice, unfeasibility serves as a descriptive assessment rather than a moral judgment. See also feasibility, infeasibility, and feasibility study.