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frivolous

[friv-uh-luh s] /ˈfrɪv ə ləs/
adjective
1.
characterized by lack of seriousness or sense:
frivolous conduct.
2.
self-indulgently carefree; unconcerned about or lacking any serious purpose.
3.
(of a person) given to trifling or undue levity:
a frivolous, empty-headed person.
4.
of little or no weight, worth, or importance; not worthy of serious notice:
a frivolous suggestion.
Origin
late Middle English
1425-1475
1425-75; late Middle English < Latin frīvolus worthless, trifling; see -ous
Related forms
frivolously, adverb
frivolousness, noun
unfrivolous, adjective
unfrivolously, adverb
unfrivolousness, noun
Can be confused
frivolity, frivolousness.
Synonyms
3. idle, silly, foolish, childish, puerile. 4. light, trifling, petty, paltry, trivial, flimsy.
Antonyms
3. serious. 4. weighty.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un frivolous

frivolous

/ˈfrɪvələs/
adjective
1.
not serious or sensible in content, attitude, or behaviour; silly a frivolous remark
2.
unworthy of serious or sensible treatment; unimportant frivolous details
Derived Forms
frivolously, adverb
frivolousness, frivolity (frɪˈvɒlɪtɪ) noun
Word Origin
C15: from Latin frīvolus silly, worthless
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for un frivolous
frivolous
1540s, from L. frivolus "silly, empty, trifling, brittle," dim. of *frivos "broken, crumbled," from friare "break, rub away, crumble." Related: Frivolously.
Online Etymology Dictionary, © 2010 Douglas Harper
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4
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