Synonym of TEDIOUS

Painful : (of a part of the body) affected with pain.
Troublesome : causing difficulty or annoyance.
Lengthy : (especially in reference to time) of considerable or unusual length, especially so as to be tedious.
Tiresome : causing one to feel bored or annoyed.
Tedious : too long, slow, or dull; tiresome or monotonous.

Synonym of Tedious is Tiresome