Difficult and Onerous

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
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