WordNet (r) 3.0 (2006):
imbalance n 1: a lack of balance or state of disequilibrium; "a hormonal imbalance" [syn: imbalance, instability, unbalance] [ant: balance] 2: (mathematics) a lack of symmetry [syn: asymmetry, dissymmetry, imbalance] [ant: balance, correspondence, symmetricalness, symmetry]