/ pəˈtɜːb; NAmE pərˈtɜːrb/ verb
[ vn ] ( formal ) to make sb worried or anxious
SYN alarm :
Her sudden appearance did not seem to perturb him in the least.
► per·turbed / -ˈtɜːbd; NAmE -ˈtɜːrbd/ adjective perturbed (at / about sth) :
a perturbed young man
She didn't seem perturbed at the change of plan.
OPP unperturbed
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WORD ORIGIN
late Middle English : from Old French pertourber , from Latin perturbare , from per- completely + turbare disturb.