[dek-er-uhs, dih-kawr-uhs, -kohr-]
characterized by dignified propriety in conduct, manners, appearance, character, etc.

1655–65; < Latin decōrus seemly, becoming, derivative of decus; see decorate, -ous

decorously, adverb
decorousness, noun
nondecorous, adjective
nondecorously, adverb
nondecorousness, noun
undecorous, adjective
undecorously, adverb
undecorousness, noun

proper, becoming.

undignified. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
decorous (ˈdɛkərəs)
characterized by propriety in manners, conduct, etc
[C17: from Latin decōrus, from decor elegance]

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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Word Origin & History

1660s, from L. decorus "becoming, seemly, fitting, proper," from decorare (see decorate). Related: decorously (1809).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
However deadly the deed, the language is always decorous and impeccably
For all its wildness, its 9000-foot peaks and grizzly bears, Glacier is the
  most decorous of parks.
Such success followed his teaching that the whole aspect of the town became
  more moral and decorous in a marvellously short time.
The chairman raps his mahogany gavel: the committee rises with a decorous
  scraping of chairs and files out murmuring.
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