Here are some synonyms for blatantly:
* Openly
* Clearly
* Obviously
* Flagrantly
* Shamelessly
* Unashamedly
* Brazenly
* Audaciously
Example:
"He blatantly disregarded the rules, causing a commotion."
This means the person did not try to hide their rule-breaking behavior; they did it in a way that was clear and obvious to everyone.