Difficult
Difficult adjective - Requiring considerable physical or mental effort.
Usage example: difficult questions on the exam that required analytical thinking
Killer and difficult are semantically related. In some cases you can use "Killer" instead an adjective "Difficult".
Nearby Word: difficulty
Both words in one sentence
- Spreadsheet programs attract the killer app label because the complex financial and statistical functions they enable are exponentially more difficult—sometimes functionally impossible—without the visual/computational assistance of the spreadsheet.
Source: Killer App -
Unfortunately, finding the killer proves difficult...In 2014 a Meta Sequel was released by MGM.
- Everybody believes Booth is the killer... and they're all being as difficult as possible to protect him.
Source: Be as Unhelpful as Possible
Cite this Source
Killer and Difficult. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/difficult/killer
Difficult & Killer. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/difficult/killer>.
Killer or Difficult. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/difficult/killer.
Google Ngram Viewer shows how "difficult" and "killer" have occurred on timeline