From the ArcaMax Publishing, Vocabulary Newsletter:
http://www.arcamax.com/news/vocabulary/s-343405-367883
specious \SPEE-shuhs\ (adjective) - 1 : Apparently right;
superficially fair, just, or correct, but not so in reality; as,
"specious reasoning; a specious argument." 2 : Deceptively pleasing or
attractive.
"Our breach of hospitality went to my conscience a little; but I
quickly silenced that monitor by two or three specious reasons, which
served to satisfy and reconcile me to myself." -- Oliver Goldsmith,
'The Vicar of Wakefield'
Specious is from Latin speciosus, from species, "appearance," from
specere, "to look at."