fatiguing

from The Collaborative International Dictionary of English v.0.48

Fatigue \Fa*tigue"\, v. t. [imp. & p. p. {Fatigued}; p. pr. &
   vb. n. {Fatiguing}, n.] [Cf. F. fatiguer. See {Fatigue}, n.]
   To weary with labor or any bodily or mental exertion; to
   harass with toil; to exhaust the strength or endurance of; to
   tire.

   Syn: To jade; tire; weary; bore. See {Jade}.
        [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

27 Moby Thesaurus words for "fatiguing":
      boresome, boring, devitalizing, draining, enervating, enfeebling,
      exhausting, fatiguesome, grueling, irksome, killing, punishing,
      sapping, straining, stressful, stupefyingly boring, stuporific,
      tiresome, tiring, toilsome, trying, weakening, weariful, wearing,
      wearisome, wearying, yawny

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