Complex
Complex adjective - Having many parts or aspects that are usually interrelated.
Usage example: complex issues regarding free speech and school discipline
Difficult is a synonym for complex in complicated topic. In some cases you can use "Difficult" instead an adjective "Complex", when it comes to topics like characteristic, property, abstruse. popular alternative
Difficult
Difficult adjective - Requiring considerable physical or mental effort.
Usage example: difficult questions on the exam that required analytical thinking
Complex is a synonym for difficult in complicated topic. You can use "Complex" instead an adjective "Difficult", if it concerns topics such as characteristic, composite, abstruse, problematical. popular alternative
Nearby Word: difficulty
Mutual synonyms
Both words in one sentence
- If the task is too difficult or complex, things can get ugly, because Meeseeks can't handle existing for too long.
Source: Random Passerby Advice - The 'Flying Over the Head' Law: Any arguments that require difficult or complex skills will be ignored by the intended recipient, due to lacking said skills.
- Heinlein was a vocal proponent of the notion that juvenile readers were far more sophisticated and able to handle complex or difficult themes than most people realized.
Source: TV Teen
Cite this Source
Difficult and Complex. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/complex/difficult
Complex & Difficult. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/complex/difficult>.
Difficult or Complex. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/complex/difficult.
Google Ngram Viewer shows how "complex" and "difficult" have occurred on timeline