The Collaborative International Dictionary of English v.0.48:

Troublesome \Trou"ble*some\, a.
   Giving trouble or anxiety; vexatious; burdensome; wearisome.
   [1913 Webster]

         This troublesome world.                  --Book of
                                                  Common Prayer.
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         These troublesome disguises that we wear. --Milton.
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         My mother will never be troublesome to me. --Pope.
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   Syn: Uneasy; vexatious; perplexing; harassing; annoying;
        disgusting; irksome; afflictive; burdensome; tiresome;
        wearisome; importunate.
        [1913 Webster] -- Trou"ble*some*ly, adv. --
        Trou"ble*some*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

troublesomeness
    n 1: a difficulty that causes anxiety [syn: troublesomeness,
         inconvenience, worriment]