*unprobably*

adv. [ Un- + L. probabilis approvable, fr. probare to approve. Cf. Probable. ] In a manner not to be approved of; improperly. [ Obs. & R. ] [ 1913 Webster ]

To diminish, by the authority of wise and knowing men, things unjustly and unprobably crept in. Strype. [ 1913 Webster ]