Difficult
Difficult adjective - Requiring considerable physical or mental effort.
Usage example: difficult questions on the exam that required analytical thinking
Serious is a synonym for difficult in easy topic. In some cases you can use "Serious" instead an adjective "Difficult".
Nearby Word: difficulty
Serious
Serious adjective - Requiring effort or concentration; complex and not easy to answer or solve.
Usage example: raised serious objections to the proposal
Difficult is a synonym for serious in easy topic. Sometimes you can use "Difficult" instead an adjective "Serious", if it concerns topics such as important, crucial.
Nearby Words: seriously, seriousness
Mutual synonyms
Both words in one sentence
- Yes, it is a fairly serious and difficult military strategy game not unlike the Nintendo Wars series, with all the goofy Parodius characters such as Moai heads, penguins, octopi and dogs in business suits!
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It's also not entirely difficult to tear a blood vessel in your throat by coughing or vomiting and seeing blood, which doesn't have any serious consequences.
Source: Incurable Cough of Death -
He also has serious kickback and is one of the most difficult characters to aim with.
Source: Video Game / killer7
Cite this Source
Serious and Difficult. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/difficult/serious
Difficult & Serious. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/difficult/serious>.
Serious or Difficult. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/difficult/serious.
Google Ngram Viewer shows how "difficult" and "serious" have occurred on timeline