Arduous and Difficile

Arduous adjective - Requiring considerable physical or mental effort.

Difficile and arduous are semantically related In some cases you can use "Difficile" instead an adjective "Arduous".

Nearby Word: arduously

Arduous and difficile are semantically related in difficult topic. You can use "Arduous" instead an adjective "Difficile", if it concerns topics such as hard to do.