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Webster 1913 Edition

adv.

[Pref.

un-

not +

probably

Improbably.

adv.

[

Un-

+ L.

probabilis

approvable, fr.

probare

to approve. Cf.

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.

unprobably ‎(comparative more unprobably, superlative most unprobably)

(obsolete, rare) In a manner not to be approved of; improperly.
To diminish, by the authority of wise and knowing men, things unjustly and unprobably crept in. — Strype.
(obsolete) improbably