From Longman Dictionary of Contemporary Englishunsettleun‧set‧tle /ʌnˈsetl/ verb [transitive] NERVOUSto make someone feel slightly nervous, worried, or upset The sudden changes unsettled Judy.→ See Verb table
Examples from the Corpus
unsettle• She was still recovering from the accident so he avoided any subjects which might unsettle her.• The threat of war has been enough to unsettle international oil traders.• His silence unsettled me.• Still, it has been enough to unsettle oil traders.• Fellows like him unsettle other patients.• Ted's angry outbursts unsettled the whole family. 