Question

arduous has the same or almost the same meaning as:
impetuous
straining
disingenuous
confusing

Explanation:

The word "arduous" means difficult and tiring. "Impetuous" means acting quickly without thinking. "Disingenuous" means not sincere. "Confusing" means causing confusion. "Straining" means causing physical or mental effort, which is similar to "arduous".

Answer:

straining