Origin: 1325–75; ME
perturben (< OF
perturber) < L
perturbāre to throw into confusion, equiv. to
per- per- +
turbāre to disturb;
see turbid 
Related forms: per⋅turb⋅a⋅ble, adjective
per⋅turb⋅a⋅bil⋅i⋅ty, noun
per⋅turb⋅ed⋅ness, noun
per⋅turb⋅ing⋅ly, adverb
per⋅turb⋅ment, noun
Synonyms:
1. trouble. 2. confuse, addle, muddle.
Antonyms:
1. pacify.