"greatly disturbed, agitated," 1510s, past-participle adjective from perturb (v.).
Entries linking to perturbed
perturb v.
late 14c., perturben, "disturb greatly, disturb mentally; cause disorder in," from Old French perturber "disturb, confuse" (14c.) and directly from Latin perturbare "to confuse, disorder, disturb," especially of states of the mind, from per "through" (from PIE root *per- (1) "forward," hence "through") + turbare "disturb, confuse," from turba "turmoil, crowd" (see turbid). Related: Perturbed; perturbing.
imperturbed adj.
1721, from assimilated form of in- (1) "not" + perturbed. Related: Imperturbedly.