Unprobably
Un`prob´a`bly
adv. 1. Improbably.
1. 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.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.