Professional
Professional adjective - Of or relating to or suitable as a profession.
Serious and professional are semantically related. In some cases you can use "Serious" instead an adjective "Professional".
Serious
Serious adjective - Not joking or playful in mood or manner.
Usage example: I'm serious when I say that no one should be walking in that neighborhood at night
Professional and serious are semantically related. Sometimes you can use "Professional" instead an adjective "Serious".
Nearby Words: seriously, seriousness
Mutual synonyms
Both words in one sentence
- Interestingly enough, he's always shown to be VERY serious and professional in that role, contrary to his usual authority-sticking personality.
Source: Consummate Professional - While he's quirky like literally everyone else in the franchise, he goes out of his way to be exceedingly professional and serious on the job and is rather ruthless in court.
Source: Consummate Professional -
For a character who's cool, calm and unfazed (but no less professional and serious) it is done with periods, sometimes to show being serious, others to show whomever just used the exclamation points that they're not impressed.
Source: Punctuated! For! Emphasis!
Cite this Source
Serious and Professional. (2016). Retrieved 2026, August 10, from https://thesaurus.plus/related/professional/serious
Professional & Serious. N.p., 2016. Web. 10 Aug. 2026. <https://thesaurus.plus/related/professional/serious>.
Serious or Professional. 2016. Accessed August 10, 2026. https://thesaurus.plus/related/professional/serious.
Google Ngram Viewer shows how "professional" and "serious" have occurred on timeline