Arduous and Rigorous

Arduous adjective - Requiring considerable physical or mental effort.

Rigorous is a synonym for arduous in difficult topic. In some cases you can use "Rigorous" instead an adjective "Arduous", when it comes to topics like heavy.

Nearby Word: arduously

Rigorous adjective - Requiring considerable physical or mental effort.

Arduous is a synonym for rigorous in heavy topic. You can use "Arduous" instead an adjective "Rigorous".

Nearby Words: rigorously, rigor, rigour, rigorism