- of, showing, or characterized by deep thought.
- of grave or somber disposition, character, or manner: a serious occasion; a serious man.
- being in earnest; sincere; not trifling: His interest was serious.
- requiring thought, concentration, or application: serious reading; a serious task.
- weighty or important: a serious book; Marriage is a serious matter.
- giving cause for apprehension; critical: The plan has one serious flaw.
- Medicine/Medical. (of a patient's condition) having unstable or otherwise abnormal vital signs and other unfavorable indicators, as loss of appetite and poor mobility: patient is acutely ill.
- that which is of importance, grave, critical, or somber: You have to learn to separate the serious from the frivolous.
Origin of serious
SynonymsSee more synonyms on Thesaurus.com
Examples from the Web for seriousness
If nothing else, the sheer size of the “religious liberty” movement indicates its seriousness of purpose.RFRA Madness: What’s Next for Anti-Democratic ‘Religious Exemptions’
November 16, 2014
But “he was so shocked by the disorganization and lack of seriousness that he submitted his papers to retire.”The CIA’s Wrong: Arming Rebels Works
October 19, 2014
It takes the seriousness out of dating and makes casual sex easier to find.Swipe Right For Sex: Mixxxer Is Tinder for the Porn Star Set
October 4, 2014
Anyone who had any doubts about his seriousness soon lost them because it was clear that Peter was hardcore.ISIS Thugs Behead Peter Kassig
October 4, 2014
How from now on we were going to be seeing in Prince Harry nothing but a model of discretion, seriousness and best behaviour?Prince Harry Parties TOPLESS
July 28, 2014
"It were hard to say," replied Mr. Raymount with some seriousness.Weighed and Wanting
Dick went on speaking with a seriousness suited to the magnitude of his interests.
His surprise would have been ludicrous but for the seriousness of the situation to all concerned.
Notwithstanding, she possessed in full the Brontë seriousness, the Brontë strength of will.The Tenant of Wildfell Hall
I mean to say, it could hardly have been meant in all seriousness.Ruggles of Red Gap
Harry Leon Wilson
- grave in nature or disposition; thoughtfula serious person
- marked by deep feeling; in earnest; sincereis he serious or joking?
- concerned with important mattersa serious conversation
- requiring effort or concentrationa serious book
- giving rise to fear or anxiety; criticala serious illness
- informal worthy of regard because of substantial quantity or qualityserious money; serious wine
- informal extreme or remarkablea serious haircut
Word Origin and History for seriousness
mid-15c., "expressing earnest purpose or thought" (of persons), from Middle French sérieux "grave, earnest" (14c.), from Late Latin seriosus, from Latin serius "weighty, important, grave," probably from a PIE root *swer- (4) "heavy" (cf. Lithuanian sveriu "to weigh, lift," svarus "heavy;" Old English swære "heavy," German schwer "heavy," Gothic swers "honored, esteemed," literally "weighty"). As opposite of jesting, from 1712; as opposite of light (of music, theater, etc.), from 1762. Meaning "attended with danger" is from 1800.
- Being of such import as to cause anxiety, as of a physical condition.