Difficult
Difficult adjective - Requiring considerable physical or mental effort.
Robust and difficult are semantically related. In some cases you can replace term "Robust" with "Difficult", this adjectives are similar.
Nearby Word: difficulty
Robust
Robust adjective - Enjoying health and vigor.
Difficult and robust are semantically related. Sometimes you can use "Difficult" instead an adjective "Robust".
Nearby Words: robustness, robustly
Both words in one sentence
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Flywheel-powered flippers, like Warrior Clan's main robot in the ABC reboot, are very difficult to design and build due to the complex and robust mechanical linkage needed to transfer the flywheel's stored energy to the flipper arm.
Source: Series / BattleBots
Cite this Source
Robust and Difficult. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/difficult/robust
Difficult & Robust. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/difficult/robust>.
Robust or Difficult. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/difficult/robust.
Google Ngram Viewer shows how "difficult" and "robust" have occurred on timeline