The word is obscure.
To put an obstacle in the way
obscures
"vague"
"vague".
muddy
Crypt is a word meaning hidden. Therefore, cryptology is the study of hidden information, encryption means to make hidden, and cryptic is that something's meaning is hidden. Another word is cryptography, which means hidden writing.
fuzzy
This could be vague.
A word that starts with the letter A and means move is:ambulate
Modernize is a word that starts with m and means to upgrade.
"Administrator" is a word that means leader and starts with the letter a.
Make is a word that means to create and starts with "m".