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tenebrous

[ten-uh-bruh s] /ˈtɛn ə brəs/
adjective
1.
dark; gloomy; obscure.
Also, tenebrious
[tuh-neb-ree-uh s] /təˈnɛb ri əs/ (Show IPA)
.
Origin
late Middle English
1375-1425
1375-1425; late Middle English < Latin tenebrōsus. See Tenebrae, -ous
Related forms
tenebrousness, noun
untenebrous, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for tenebrious

tenebrous

/ˈtɛnəbrəs/
adjective
1.
gloomy, shadowy, or dark
Derived Forms
tenebrosity (ˌtɛnəˈbrɒsɪtɪ), tenebrousness, tenebriousness, noun
Word Origin
C15: from Latin tenebrōsus from tenebrae darkness
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for tenebrious
tenebrous
"full of darkness," c.1420, from O.Fr. tenebreus (11c.), from L. tenebrosus, from tenebræ "darkness" (see temerity).
Online Etymology Dictionary, © 2010 Douglas Harper
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