unsettle Meaning, Definition & Usage

  1. verb disturb the composure of
    faze; enervate; unnerve.

WordNet

Un*set"tle transitive verb
Etymology
1st pref. un- + settle.
Definitions
  1. To move or loosen from a settled position or state; to unfix; to displace; to disorder; to confuse.
Un*set"tle intransitive verb
Definitions
  1. To become unsettled or unfixed; to be disordered. Shak.

Webster 1913