deflated

Deflated is an adjective meaning that something has lost air, gas, or pressure. It is the past participle of the verb deflate. Objects that are commonly described as deflated include tires, balloons, balls, and other inflatables. The term can also be used in a figurative sense to describe a person or mood that feels diminished or discouraged.

In physical terms, deflation occurs when air or gas is removed from an enclosed volume, causing a drop in internal pressure and often a reduction in size. It can be intentional, as with releasing air from a bicycle tire or a balloon, or it can be the result of a puncture, leak, or equipment failure. Some inflatables are designed to safely vent air to avoid bursting.

Common uses: a deflated tire wears unevenly and is harder to control; a deflated basketball or soccer ball loses bounce; a deflated balloon collapses. Vehicles and gear that rely on internal pressure require regular monitoring of pressure and structural integrity.

In economics, deflation refers to a general decline in prices, and 'deflated' prices can be used to mean prices adjusted to remove the effects of inflation, often via a price index. The term is also used metaphorically, as in a deflated ego.