WordWeb Online

1. A lack of balance or state of disequilibrium
   - imbalance, instability
    
2. A state of mental disturbance and disorientation
   - derangement, mental unsoundness

1. Throw out of balance or equilibrium
   "The tax relief unbalanced the budget"; "The prima donna unbalances the smooth work in our department"
    
2. Derange mentally, throw out of mental balance; make insane
   "The death of his parents unbalanced him"
   - derange

Derived forms: unbalanced, unbalances, unbalancing

Type of: craze, disequilibrium, insanity, madden

Antonym: balance