1. 
[syn: boring, deadening, dull, ho-hum, irksome, slow, tedious, tiresome, wearisome]
The Collaborative International Dictionary of English v.0.48:
Wearisome \Wea"ri*some\, a.
   Causing weariness; tiresome; tedious; weariful; as, a
   wearisome march; a wearisome day's work; a wearisome book.
   [1913 Webster]
         These high wild hills and rough uneven ways
         Draws out our miles, and makes them wearisome. --Shak.
   [1913 Webster]
   Syn: Irksome; tiresome; tedious; fatiguing; annoying;
        vexatious. See Irksome.
        [1913 Webster] -- Wea"ri*some*ly, adv. --
        Wea"ri*some*ness, n.
        [1913 Webster]
WordNet (r) 3.0 (2006):
wearisome
    adj 1: so lacking in interest as to cause mental weariness; "a
           boring evening with uninteresting people"; "the deadening
           effect of some routine tasks"; "a dull play"; "his
           competent but dull performance"; "a ho-hum speaker who
           couldn't capture their attention"; "what an irksome task
           the writing of long letters is"- Edmund Burke; "tedious
           days on the train"; "the tiresome chirping of a cricket"-
           Mark Twain; "other people's dreams are dreadfully
           wearisome" [syn: boring, deadening, dull, ho-hum,
           irksome, slow, tedious, tiresome, wearisome]
Moby Thesaurus II by Grady Ward, 1.0:
91 Moby Thesaurus words for "wearisome":
   Herculean, aggravating, annoying, arduous, backbreaking, black,
   bleak, boresome, boring, bothering, bothersome, burdensome,
   crushing, dark, dismal, disturbing, draining, drear, drearisome,
   dreary, effortful, exasperating, exhausting, fatiguesome,
   fatiguing, forced, funebrial, funereal, galling, gloomy, grave,
   gray, grim, grueling, harassing, hard-earned, hard-fought, heavy,
   hefty, importunate, importune, irking, irksome, irritating,
   killing, labored, laborious, onerous, operose, oppressive, painful,
   pesky, pestering, pestiferous, pestilent, pestilential, plaguesome,
   plaguey, plaguing, provoking, punishing, saturnine, solemn, somber,
   sombrous, strained, straining, strenuous, stressful,
   stupefyingly boring, stuporific, teasing, tiresome, tiring,
   toilsome, tormenting, tough, triste, troublesome, troubling,
   trying, uphill, vexatious, vexing, weariful, wearing, weary,
   wearying, worrisome, worrying, yawny