Word Study
understandingly
CIDE DICTIONARY
understandingly, adv.
In an understanding manner; intelligibly; with full knowledge or comprehension; intelligently; as, to vote upon a question understandingly; to act or judge understandingly. [1913 Webster]
"The gospel may be neglected, but in can not be understandingly disbelieved." [1913 Webster]
For further exploring for "understandingly" in Webster Dictionary Online