speciously

adverb2

1. •
   In a specious manner; fallaciously and erroneously, but seeming superficially to be correct.

   • Exasperated, as he might speciously allege, by the injuries of a similar nature, he hastened with a few followers to join the standard, and to betray the confidence, of his too credulous friend. — 1781
2. •
   Specially.

   • I will do what I can for them all three, for so I haue promisd, and Ile bee as good as my word, but speciously for M. Fenton. — 1597