Un*prob"a*bly (?), adv. [Pref. un- not
+ probably.] Improbably.
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.