serious

[seer-ee-uhs]
adjective
1.
of, showing, or characterized by deep thought.
2.
of grave or somber disposition, character, or manner: a serious occasion; a serious man.
3.
being in earnest; sincere; not trifling: His interest was serious.
4.
requiring thought, concentration, or application: serious reading; a serious task.
5.
weighty or important: a serious book; marriage is a serious matter.
6.
giving cause for apprehension; critical: The plan has one serious flaw.
7.
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.
noun
8.
that which is of importance, grave, critical, or somber: You have to learn to separate the serious from the frivolous.

Origin:
1400–50; late Middle English < Latin sērius or Late Latin sēriōsus; see -ous, -ose1

seriousness, noun
half-serious, adjective
half-seriously, adverb
half-seriousness, noun
nonserious, adjective
nonseriously, adverb
nonseriousness, noun
overserious, adjective
overseriously, adverb
overseriousness, noun
quasi-serious, adjective
quasi-seriously, adverb
superserious, adjective
superseriously, adverb
superseriousness, noun
ultraserious, adjective
ultraseriously, adverb
ultraseriousness, noun
unserious, adjective
unseriously, adverb
unseriousness, noun


2. sober, sedate, staid. 3. See earnest1. 5. momentous, grave.


3, 5. trivial.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
serious (ˈsɪərɪəs)
 
adj
1.  grave in nature or disposition; thoughtful: a serious person
2.  marked by deep feeling; in earnest; sincere: is he serious or joking?
3.  concerned with important matters: a serious conversation
4.  requiring effort or concentration: a serious book
5.  giving rise to fear or anxiety; critical: a serious illness
6.  informal worthy of regard because of substantial quantity or quality: serious money; serious wine
7.  informal extreme or remarkable: a serious haircut
 
[C15: from Late Latin sēriōsus, from Latin sērius; probably related to Old English swǣr gloomy, Gothic swers esteemed]
 
'seriousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

serious
1440, "expressing earnest purpose or thought" (of persons), from M.Fr. sérieux "grave, earnest" (14c.), from L.L. seriosus, from L. serius "weighty, important, grave," probably from a PIE base *swer- (cf. Lith. sveriu "to weigh, lift," svarus "heavy;" O.E. swære "heavy," Ger. schwer "heavy,"
Goth. swers "honored, esteemed," lit. "weighty"). As opposite of jesting, from 1712; as opposite of light (of music, theater, etc.), from 1762. Meaning "attended with danger" is from 1800. Phrase to take (something) seriously is attested from 1782.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

serious se·ri·ous (sēr'ē-əs)
adj.
Being of such import as to cause anxiety, as of a physical condition.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Slang Dictionary

serious definition


  1. mod.
    good; profound; excellent. (See also heavy.) : Man, these tunes are, like, serious.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
Once the seriousness of the situation became apparent, there was no escaping.
The expression in the eyes-mirth, seriousness, sadness-sets the tone.
The seriousness of neglect is judged according to the magnitude or risk of harm
  and by its chronicity.
The plant has been circled with crime-scene tape to call attention to the
  seriousness of the situation.
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