Webster's English Dictionary

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unstable

Cross references:
  1. inconstant            
 
un.sta.ble \-'sta--b*l\ \-b(*-)le-\ aj : not stable : not firm or fixed : 
   not constant : as  : FLUCTUATING, IRREGULAR  : FICKLE, VACILLATING  : 
   UNSTEADY  : readily decomposing or changing otherwise in chemical 
   composition or b iological activity : characterized by inability to control 
   the emotions  - un.sta.ble.ness n