boring (part of speech: verb)
fatiguing (part of speech: verb)
- I do not know anything more tiring or more discouraging! - "My War Experiences in Two Continents", Sarah Macnaughtan.
- I remember my first drive- round Regent's Park, on a perfect May day, in the steam- car of which I have already spoken; and very tiring I found it. - "A New Medley of Memories", David Hunter-Blair.
- At first she seemed surprised at its tiring so soon. - "Children of the Wild", Charles G. D. Roberts.