[Alteration of SPECIALLY adv.] Specially, notably, principally.
The form also occurs in mod. dial. (Eng. Dial. Dict.).
1598. Shaks., Merry W., III. iv. 113. [Mrs.] Quickly. I will do what I can for them all three, and Ile bee as good as my word, but speciously for M. Fenton. Ibid., IV. v. 114. Qui. Haue not they sufferd? Yes, I warrant; speciously one of them.