Arduousness is defined as the state of being difficult or arduous, which can sometimes be exhausting or overwhelming. As such, it is helpful to have a few synonyms in one's vocabulary when faced with such trying times. Some synonyms for arduousnesses include difficulty, hardship, laboriousness, onerousness, toil, exertion, fatigue, weariness, and struggle. These synonyms all convey the notion of being hard work, something that requires significant effort, dedication, and perseverance to overcome. By being aware of these synonyms, and utilizing them appropriately in written or spoken communication, one can more effectively convey the inherent challenges and obstacles that may arise in life.