It is improper.
The prefix for proper is pro
The proper prefix for a female if you don't know if she is married is "Ms." This term can be used for all women, regardless of their marital status.
impure
A hyphen is used to separate a prefix from a proper noun or adjective, especially when the combination could be confusing or misleading without it.
Proper
The prefix "im" is a variant of the prefix "in". It creates the opposite of the original word. Examples are: moveable / immovable; possible / impossible.
Ms.
The proper prefix would be "Ms." "Miss" is for unmarried women. "Mrs." is used for married women. "Ms." is used when marital status is unknown or when the woman does not disclose it intentionally.
pro-European
The Dutch surname (with prefix) is usually spelled van Gogh (e.g. artist Vincent van Gogh).(the prefix van is not capitalized in proper usage)
Prefix: im- (improper) Suffix: -ly (properly)
The proper term is noninvolvement, rather than using the un- prefix as in uninvolved.