What is "unprobably"

Unprobably \Un*prob"a*bly\, adv. [Pref. un- not + probably.] Improbably.

Unprobably \Un*prob"a*bly\, adv. [Un- + L. probabilis approvable, fr. probare to approve. Cf. Probable.] In a manner not to be approved of; improperly. [Obs. & R.]

To diminish, by the authority of wise and knowing men, things unjustly and unprobably crept in.
--Strype.

adv. 1 (context obsolete rare English) In a manner not to be approved of; improperly. 2 (context obsolete English) improbably