Important
Important adjective - Having great meaning or lasting effect.
Usage example: the discovery of penicillin was a very important event in the history of medicine
Serious is a synonym for important in valuable topic. In some cases you can use "Serious" instead an adjective "Important", when it comes to topics like grave, significant. popular alternative
Serious
Serious adjective - Having a matter of importance as its topic.
Usage example: a very serious film that dealt with the aftermath of the Gulf War
Important is a synonym for serious in property topic. You can use "Important" instead an adjective "Serious", if it concerns topics such as grave, crucial. popular alternative
Nearby Words: seriously, seriousness
Mutual synonyms
Related pairs
- notable and important
- notable and serious
- material and important
- material and serious
- considerable and important
- considerable and serious
- substantial and important
- substantial and serious
- critical and important
- critical and serious
- heavy and important
- heavy and serious
- grave and important
- grave and serious
Both words in one sentence
- Whenever Keitaro becomes serious in Ancestor, he's talking about something very important/serious, even more so when he raises his voice.
Source: OOC Is Serious Business / Fanfic - After a long series of less-than-serious threads, a few rather important and serious threads popped up in the days before then.
Source: Roleplay / Persona Rebirth -
Their problems are just as serious and important to them as anyone elses are, however they don't affect the outcome of many peoples lives, or involve killing or mind raping anyone.
Source: Roleplay / TURNINGCOLORS
Cite this Source
Serious and Important. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/important/serious
Important & Serious. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/important/serious>.
Serious or Important. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/important/serious.
Google Ngram Viewer shows how "important" and "serious" have occurred on timeline