Origin: 1175–1225; Middle English disto(u)rben, disturben < Anglo-French disto(u)rber, desturber < Latin disturbāre to demolish, upset, equivalent to dis-dis-1 + turbāre to confuse
early 13c., from L. disturbare "throw into disorder," from dis- "completely" + turbare "to disorder, disturb," from turba "turmoil." Disturbed "emotionally or mentally unstable" is from 1904. Related: Disturbing.