Fuel-poor is an adjective used to describe a situation where there is not enough fuel available to meet the requirements of a specific activity or process. Some synonyms for fuel-poor include energy-deficient, fuel-depleted, energy-starved, fuel-scarce, fuel-limited and fuel-restricted. These terms convey the idea of a lack of resources to support the needs of a system or activity. Common examples of fuel-poor situations include power shortages, low fuel economy in vehicles and aircraft, and insufficiencies in heat generation for industrial processes. Regardless of the context, being fuel-poor can have a significant impact on efficiency, productivity and environmental sustainability.