verb (v)

• disturb in mind or make uneasy or cause to be worried or alarmed(verb.emotion)

  Example:
  She was rather perturbed by the news that her father was seriously ill.
  

  Synonym:
  cark, disorder, disquiet, distract, trouble, unhinge
  

  source: wordnet30
• disturb or interfere with the usual path of an electron or atom(verb.motion)

  Example:
  The electrons were perturbed by the passing ion.
  

  source: wordnet30
• cause a celestial body to deviate from a theoretically regular orbital motion, especially as a result of interposed or extraordinary gravitational pull(verb.motion)

  Example:
  The orbits of these stars were perturbed by the passings of a comet.
  

  source: wordnet30
• throw into great confusion or disorder(verb.change)

  Example:
  Fundamental Islamicists threaten to perturb the social order in Algeria and Egypt.
  

  Synonym:
  derange, throw out of kilter
  

  source: wordnet30
• To disturb; to agitate; to vex; to trouble; to disquiet.(verb)

  source: webster1913