Blatant means obvious in a bold, often shameless way. It usually describes something that is plainly visible or impossible to miss, especially when it feels rude, dishonest, or offensive.
Flagrant means conspicuously bad, shocking, or clearly in violation of rules or standards. It often appears when talking about misconduct, abuse, or serious wrongdoing.
The key contrast is simple: blatant emphasizes obviousness, while flagrant emphasizes serious wrongdoing or violation.
- His lie was blatant.
- The company made a blatant attempt to mislead buyers.
- The referee called a flagrant foul.
- The report described a flagrant abuse of power.
You can sometimes use both for the same situation, but the focus changes. A blatant act is easy to see. A flagrant act is shockingly wrong. If you mean clear visibility, choose blatant. If you mean a serious offense or breach, choose flagrant.