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Verb: unsettle  ,ún'se-t(u)l
  1. Disturb the composure of
    "The kids are so comfortably settled, isn't it a pity to unsettle them?";
    - faze, unnerve, enervate, rattle [informal]

Derived forms: unsettled, unsettling, unsettles

Type of: discomfit, discompose, disconcert, untune, upset