Source : Webster's Revised Unabridged Dictionary (1913)

Troublesome \Trou"ble*some\, a.
   Giving trouble or anxiety; vexatious; burdensome; wearisome.

         This troublesome world.                  --Book of
                                                  Common Prayer.

         These troublesome disguises that we wear. --Milton.

         My mother will never be troublesome to me. --Pope.

   Syn: Uneasy; vexatious; perplexing; harassing; annoying;
        disgusting; irksome; afflictive; burdensome; tiresome;
        wearisome; importunate. -- {Trou"ble*some*ly}, adv. --
        {Trou"ble*some*ness}, n.

Source : WordNet®

troublesome
     adj : difficult to deal with; "a troublesome infection"; "a
           troublesome situation"