unbalance

un- +‎ balance

unbalance (third-person singular simple present unbalances, present participle unbalancing, simple past and past participle unbalanced)

1. (transitive) To cause to be out of balance.

   If you put that weight on the edge of the tray, it will unbalance it and dump all of the dishes on the floor.

   • 1913, Arthur Conan Doyle, “(please specify the page)”, in The Poison Belt […], London; New York, N.Y.: Hodder and Stoughton, →OCLC:

     Or, finally, might our awful situation prey upon and unbalance our minds? A group of insane folk upon a dead world!