Source : Webster's Revised Unabridged Dictionary (1913)

Toilsome \Toil"some\ (-s[u^]m), a.
   Attended with toil, or fatigue and pain; laborious;
   wearisome; as, toilsome work.

         What can be toilsome in these pleasant walks? --Milton.
   -- {Toil"some*ly}, adv. -- {Toil"some*ness}, n.

Source : WordNet®

toilsome
     adj : characterized by toilsome effort to the point of exhaustion;
           especially physical effort; "worked their arduous way
           up the mining valley"; "a grueling campaign"; "hard
           labor"; "heavy work"; "heavy going"; "spent many
           laborious hours on the project"; "set a punishing pace"
           [syn: {arduous}, {backbreaking}, {grueling}, {gruelling},
            {hard}, {heavy}, {laborious}, {punishing}]