Definition of specious adjective from the Oxford Advanced Learner's Dictionary

 

specious

 adjective
adjective
BrE BrE//ˈspiːʃəs//
 
; NAmE NAmE//ˈspiːʃəs//
 
(formal)
 
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seeming right or true but actually wrong or false synonym misleading a specious argument Word Origin late Middle English (in the sense ‘beautiful’): from Latin speciosus ‘fair’, from species ‘appearance, form, beauty’, from specere ‘to look’.
See the Oxford Advanced American Dictionary entry: specious