Example sentences:

Ramayana: Vibhishana reminded Ravana that because Hanuman was a messenger, killing him would be a flagrant violation of time-honored diplomatic codes.  

Mahabharata:  When six warriors ganged together to kill the sixteen-year-old Abhimanyu, that was the most flagrant violation of war codes in the Kurukshetra war.

Bhagavad-gita:  The mind is usually not flagrant in its defiance of the values we hold dear; it slowly and subtly weakens our conviction to live according to those values.