unsettle

Unsettle \Un*set"tle\, v. t. [1st pref. un- + settle.] To move or loosen from a settled position or state; to unfix; to displace; to disorder; to confuse. [1913 Webster]

Unsettle \Un*set"tle\, v. i. To become unsettled or unfixed; to be disordered. --Shak. [1913 Webster]