Tedious, a. — Webster enters it under “tedious”
Etymology: [L. taediosus, fr. taedium. See Tedium.]
Involving tedium; tiresome from continuance, prolixity, slowness, or the like; wearisome. -- Te"di*ous*ly, adv. -- Te"di*ous*ness, n. I see a man's life is a tedious one. Shak. I would not be tedious to the court. Bunyan.
Syn. -- Wearisome; fatiguing. See Irksome.
Shades of meaning
Fernald has no entry of its own for tediousness; he lists it under circumlocution.
Where he writes about it:
Tediousness is the sure result of any of these faults of style. — from circumlocution