Etymology
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unbalance (v.)

1856, from un- (2) "reverse, opposite of" + balance (v.).

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Definitions of unbalance
1
unbalance (v.)
throw out of balance or equilibrium;
The tax relief unbalanced the budget
The prima donna unbalances the smooth work in our department
unbalance (v.)
derange mentally, throw out of mental balance; make insane;
The death of his parents unbalanced him
Synonyms: derange
2
unbalance (n.)
a lack of balance or state of disequilibrium;
Synonyms: imbalance / instability
unbalance (n.)
a state of mental disturbance and disorientation;
Synonyms: derangement / mental unsoundness
From wordnet.princeton.edu