Difficult
Difficult adjective - Requiring considerable physical or mental effort.
Keen and difficult are semantically related. In some cases you can replace term "Keen" with "Difficult", this adjectives are similar.
Nearby Word: difficulty
Both words in one sentence
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When he comes to, he's naturally keen to track down the people responsible and do something about it, but since he doesn't know who they were or what they wanted, it's rather difficult.
Source: Literature / Eddie LaCrosse - All Lesbians Want Kids: Nearly subverted by a couple where one of them is eager to adopt a difficult young boy while the other isn't quite as keen but comes around to being a parent in the end.
Source: Series / Casualty - This actually makes guard towers somewhat dangerous, as Nod Officers tend to hide in them, and it's usually difficult to take them out without going into the tower yourself (unless the Officer is keen on completely ignoring you, which he likely is).
Source: Ladder Physics
Cite this Source
Keen and Difficult. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/difficult/keen
Difficult & Keen. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/difficult/keen>.
Keen or Difficult. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/difficult/keen.
Google Ngram Viewer shows how "difficult" and "keen" have occurred on timeline