Merriam-Webster Collegiate Dictionary - trouble

 I. verb  (~d; troubling)  Etymology: Middle English, from Anglo-French trubler, from Vulgar Latin *turbulare, from *turbulus agitated, alteration of Latin turbulentus — more at turbulent  Date: 13th century  transitive verb  1.  a. to agitate mentally or spiritually ; worry, disturb  b.  (1) archaic mistreat, oppress  (2) to produce physical disorder in ; afflict ~d by a cold  c. to put to exertion or inconvenience I'm sorry to ~ you  2. to put into confused motion the wind ~d the sea  intransitive verb  1. to become mentally agitated ; worry refused to ~ over trifles  2. to make an effort ; be at pains did not ~ to come  • ~r noun  II. noun  Date: 13th century  1. the quality or state of being ~d especially mentally  2. public unrest or disturbance there's ~ brewing downtown  3. an instance of ~ used to disguise her frustrations and despair by making light of her ~s — Current Biography  4. a state or condition of distress, annoyance, or difficulty in ~ with the law heading for ~ got into financial ~: as  a. a condition of physical distress or ill health ; ailment back ~ heart ~  b. a condition of mechanical malfunction engine ~  c. a condition of doing something badly or only with great difficulty has ~ reading has ~ breathing  d. pregnancy out of wedlock got a girl in ~  5. an effort made ; pains took the ~ to do it right  6.  a. a cause of distress, annoyance, or inconvenience don't mean to be any ~ what's the ~?  b. a negative feature ; drawback the ~ with you is you're too honest the main ~ with electronic systems is the overreliance on them — John Perham  c. the unhappy or sad fact the ~ is, I need the money