perturb

discompose, disquiet, disturb, perturb, agitate, upset, fluster mean to destroy capacity for collected thought or decisive action. discompose implies some degree of loss of self-control or self-confidence especially through emotional stress <discomposed by the loss of his beloved wife>. disquiet suggests loss of sense of security or peace of mind <the disquieting news of factories closing>. disturb implies interference with one's mental processes caused by worry, perplexity, or interruption <the discrepancy in accounts disturbed me>. perturb implies deep disturbance of mind and emotions <perturbed by her husband's strange behavior>. agitate suggests obvious external signs of nervous or emotional excitement <in his agitated state we could see he was unable to work>. upset implies the disturbance of normal or habitual functioning by disappointment, distress, or grief <the family's constant bickering upsets the youngest child>. fluster suggests bewildered agitation <his declaration of love completely flustered her>.

The Latin word turba, meaning “disorder,” gives us the root turb. Words from the Latin turba have something to do with disorder. To disturb is to cause disorder to something or to someone's feelings. To perturb, or trouble, is to cause disorder to someone's mind. Anything turbulent is in a state of violence or disorder.