apparently good or right though lacking real merit; superficially pleasing or plausible: specious arguments.
pleasing to the eye but deceptive.
Obsolete. pleasing to the eye; fair.

1350–1400; Middle English < Latin speciōsus fair, good-looking, beautiful, equivalent to speci(ēs) (see species) + -ōsus -ous

speciously, adverb
speciousness, noun
nonspecious, adjective
nonspeciously, adverb
nonspeciousness, noun
unspecious, adjective
unspeciously, adverb
unspeciousness, noun

specie, species, specious.

1. See plausible. 2. false, misleading.

1, 2. genuine.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
specious (ˈspiːʃəs)
1.  apparently correct or true, but actually wrong or false
2.  deceptively attractive in appearance
[C14 (originally: fair): from Latin speciōsus plausible, from speciēs outward appearance, from specere to look at]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Dictionary.com's 21st Century Lexicon
Main Entry:  specious1
Part of Speech:  adj
Definition:  showily beautiful or attractive
Etymology:  Latin specissus 'beautiful, plausible'
Main Entry:  specious2
Part of Speech:  adj
Definition:  plausible but not true; based on pretense; sophistic
Etymology:  Latin specissus 'beautiful, plausible'
Dictionary.com's 21st Century Lexicon
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Word Origin & History

c.1400, "pleasing to the sight, fair," from L. speciosus "good-looking, beautiful," from species "appearance" (see species). Meaning "seemingly desirable, reasonable or probable, but not really so" is first recorded 1612.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
His arguments and specious comparisons are bogus and not worth seriously
  entertaining, in my humble opinion.
In these speeches he frequently bears the aspect of a specious demagogue.
True humility alone could discover the snare which lurked under the specious
  gloss of holy charity.
Comparing home prices to gold over time comes across to me as a bit specious.
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