friv·o·lous

[friv-uh-luhs]
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:
1425–75; late Middle English < Latin frīvolus worthless, trifling; see -ous

friv·o·lous·ly, adverb
friv·o·lous·ness, noun
un·friv·o·lous, adjective
un·friv·o·lous·ly, adverb
un·friv·o·lous·ness, noun

frivolity, frivolousness.


3. idle, silly, foolish, childish, puerile. 4. light, trifling, petty, paltry, trivial, flimsy.


3. serious. 4. weighty.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Frivolous is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Collins
World English Dictionary
frivolous (ˈfrɪvələs) [Click for IPA pronunciation guide]
 
adj
1.  not serious or sensible in content, attitude, or behaviour; silly: a frivolous remark
2.  unworthy of serious or sensible treatment; unimportant: frivolous details
 
[C15: from Latin frīvolus silly, worthless]
 
'frivolously
 
adv
 
'frivolousness
 
n
 
frivolity
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

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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Example sentences
He may be wrong, but it is not a frivolous observation.
She said contract counsel have little incentive to work on a frivolous appeal,
  other than being required by appointment to do it.
The human animal is no more frivolous and irresponsible than fearful and
  lethargic.
To deny it is to see in art only something frivolous and insincere.
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