When something is unbalanced, it's uneven or unstable. If your weight on a surfboard is unbalanced, you risk falling off.

Things can be physically unbalanced, like a seesaw with only one kid on it, or more figuratively unbalanced. For example, your mom might think you have an unbalanced diet if you rarely eat vegetables, and you'd describe your high school education as unbalanced if you didn't take any math classes. Another way to be unbalanced is to be mentally ill or emotionally disturbed.

Definitions of unbalanced
  1. adjective
    being or thrown out of equilibrium
    synonyms: imbalanced
    liable to change
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    being in a state of proper equilibrium
    counterbalanced, counterpoised
    brought into equipoise by means of a weight or force that offsets another
    harmonious, proportionate, symmetrical
    exhibiting equivalence or correspondence among constituents of an entity or between different entities
    marked by balance or equilibrium and readiness for action
    of someone or something that balances himself or itself
    maintaining equilibrium
    in an optimal state of balance or equilibrium
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  2. adjective
    affected with madness or insanity
    synonyms: brainsick, crazy, demented, disturbed, mad, sick, unhinged
    afflicted with or characteristic of mental derangement
  3. adjective
    debits and credits are not equal
    poorly balanced or matched in quantity or value or measure
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