/un set"l/ , v. , unsettled, unsettling .
v.t.
1. to alter from a settled state; cause to be no longer firmly fixed or established; render unstable; disturb: Violence unsettled the government.
2. to shake or weaken (beliefs, feelings, etc.); cause doubt or uncertainty about: doubts unsettling his religious convictions.
3. to vex or agitate the mind or emotions of; upset; discompose: The quarrel unsettled her.
v.i.
4. to become unfixed or disordered.
[ 1535-45; UN- 2 + SETTLE 1 ]
Syn. 2. upset, disturb, unbalance, confuse, disconcert.