Princeton's WordNet

1. boring, deadening, dull, ho-hum, irksome, slow, tedious, tiresome, wearisome(adj)

   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"

Wiktionary

1. tiresome(Adjective)

   Causing fatigue or boredom; wearisome.

   Eventually his long stories became tiresome.

Webster Dictionary

1. Tiresome(adj)

   fitted or tending to tire; exhausted; wearisome; fatiguing; tedious; as, a tiresome journey; a tiresome discourse

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