To be unbalanced means to lack stability, equilibrium, or fair proportion. When something is unbalanced, one side has more weight, power, or presence than the other, creating an awkward tilt or unfairness.

A seesaw becomes unbalanced when a much heavier kid sits on one end while a lighter kid sits on the other: one side crashes down while the other hangs in the air. A backpack feels unbalanced when you stuff all your books on one side, making it pull uncomfortably on your shoulder. In basketball, a team feels unbalanced if it has five great shooters but nobody who can defend or rebound.

The word also describes arguments or perspectives that ignore important information. An unbalanced news story might tell only one side of an issue, leaving out facts that would give readers a complete picture. A debate becomes unbalanced when one person gets ten minutes to speak while the other gets only one.

People sometimes use unbalanced to describe someone whose emotions or mental state seem unstable or erratic, though this usage can sound unkind or disrespectful. In any context, the word suggests something has tipped too far in one direction and needs adjustment to work properly.