specious
adjective /ˈspiːʃəs/
  /ˈspiːʃəs/
(formal)- seeming right or true but actually wrong or false synonym misleading
- a specious argument
 
Oxford Collocations DictionarySpecious is used with these nouns:- argument
 - reasoning
 
Word Originlate Middle English (in the sense ‘beautiful’): from Latin speciosus ‘fair’, from species ‘appearance, form, beauty’, from specere ‘to look’.