See unsettle in Webster's New World Roget's A-Z Thesaurus II
verb
To put out of proper order:
derange, disarrange, disarray, disorder, disorganize, disrupt, disturb, jumble, mess up, mix up, muddle, tumble, upset. See orderTo disturb the health or physiological functioning of:
derange, disorder, turn, upset. See healthTo impair or destroy the composure of:
agitate, bother, discompose, disquiet, distract, disturb, flurry, fluster, perturb, rock, ruffle, shake (up), toss, upset. (Informal) rattle. See calm
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