Un-prŏb'a-bly, adv.

adv. 1. Improbably. [Obs.] 2. [Lat. prefix in, not, and probabilis, worthy of being approved, from probare, to approve.] In a manner not to be approved of or justified; improperly; wrongly. [Obs. and very rare.] “To diminish, by the authority of wise and knowing men, things unjustly and unprobably crept in.” Strype.