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Synonyms
per·turb (pər-tûrb́)

[Middle English perturben, from Old French perturber, from Latin perturbāre, per-, per-, + turbāre, to throw into disorder (from turba, confusion) (perhaps from Greek turbē).]

transitive verb: -turbed, -turb·ing, -turbs. 

  1. To disturb greatly; make uneasy or anxious.
  2. To throw into great confusion.
  3. Physics & Astronomy To cause perturbation, as of a celestial orbit.

derivatives

per·turb́a·ble
adjective