Difficult
Difficult adjective - Requiring considerable physical or mental effort.
Useful and difficult are semantically related. In some cases you can use "Useful" instead an adjective "Difficult".
Nearby Word: difficulty
Both words in one sentence
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If you make a super powerful super rare healing potion, it'll be most useful in a similarly difficult battle but what if the player used the potion already?
Source: Too Awesome to Use - The final O-Power, the highly useful Hatching Power, is difficult to find, let alone get.
Source: Guide Dang It / Pokémon - A very useful bug allows you to cheese the final Hunter fight of Eileen the Crow's questline, normally an extremely difficult battle.
Cite this Source
Useful and Difficult. (2016). Retrieved 2026, August 01, from https://thesaurus.plus/related/difficult/useful
Difficult & Useful. N.p., 2016. Web. 01 Aug. 2026. <https://thesaurus.plus/related/difficult/useful>.
Useful or Difficult. 2016. Accessed August 01, 2026. https://thesaurus.plus/related/difficult/useful.
Google Ngram Viewer shows how "difficult" and "useful" have occurred on timeline