Difficult
Difficult adjective - Requiring considerable physical or mental effort.
Usage example: difficult questions on the exam that required analytical thinking
Onerous is a synonym for difficult in hard topic. In some cases you can use "Onerous" instead an adjective "Difficult", when it comes to topics like heavy, oppressive, burdensome, hard to do. popular alternative
Nearby Word: difficulty
Onerous
Onerous adjective - Requiring much time, effort, or careful attention.
Usage example: building the scale model of the frigate was an onerous task
Difficult is a synonym for onerous in property topic. You can use "Difficult" instead an adjective "Onerous", if it concerns topics such as heavy, burdensome, trying, weighty. popular alternative
Nearby Word: onerously
Mutual synonyms
Cite this Source
Onerous and Difficult. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/difficult/onerous
Difficult & Onerous. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/difficult/onerous>.
Onerous or Difficult. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/difficult/onerous.
Google Ngram Viewer shows how "difficult" and "onerous" have occurred on timeline