The correct answer is D. Tiresome.
A. Painful is not a synonym of tedious. Painful is something that causes physical or emotional suffering. Tedious is something that is boring or tiresome.
B. Troublesome is not a synonym of tedious. Troublesome is something that is difficult or annoying. Tedious is something that is boring or tiresome.
C. Lengthy is not a synonym of tedious. Lengthy is something that is long or drawn out. Tedious is something that is boring or tiresome.
D. Tiresome is a synonym of tedious. Tiresome is something that is boring or tiresome.
Here are some examples of how the word “tedious” can be used in a sentence:
- The meeting was tedious and I couldn’t wait for it to be over.
- The book was so tedious that I couldn’t finish it.
- The task was tedious and I almost gave up.