Both words describe something so obvious it cannot be missed, and in many sentences they are genuinely interchangeable. The difference is emphasis: blatant highlights that the person was not even trying to hide it, while flagrant highlights how shocking or severe the wrongdoing is. A blatant lie is told without shame; a flagrant foul is one everyone is outraged by.
The core difference
Blatant emphasises shameless, unhidden obviousness, while flagrant emphasises the shocking severity of an obvious wrong.
- blatant — completely obvious and unashamed, especially about something wrong: It was a blatant lie, and everyone in the room knew it.
- flagrant — shockingly obvious and clearly wrong: The referee called a flagrant foul.
How to tell them apart
Sport commentary is a good place to hear the difference. A blatant foul is one committed right out in the open, as if the player did not care who saw it. A flagrant foul carries a stronger note of outrage, as if the act itself was unusually severe or dangerous, not just visible. Because both words converge on "obviously wrong," they overlap in most everyday sentences, and swapping one for the other rarely causes a real error.
A memory hook: blatant pairs naturally with lying, cheating and disregard for rules done in plain sight, while flagrant traces back to a Latin root meaning "burning" or "blazing," so think of a flagrant violation as one that seems to blaze for all to see.
