Merriam-Webster Collegiate Dictionary - discompose

 transitive verb  Etymology: Middle English  Date: 15th century  1. to destroy the composure of  2. to disturb the order of  • discomposure noun Synonyms:  ~, disquiet, disturb, perturb, agitate, upset, fluster mean to destroy capacity for collected thought or decisive action. ~ implies some degree of loss of self-control or self-confidence especially through emotional stress ~d 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.