Blatant describes something that is offensively obvious, conspicuous, and undisguised. It suggests a crudeness, often implying a lack of subtlety or attempt at concealment, and is often used in the context of something negative or undesirable.
It can be applied to actions, behaviors, lies, or errors that are so obvious they're almost shocking or insulting.
The term emphasizes not only the visibility of something but also the lack of shame or remorse accompanying it.
OVERT
PATENT BRAZEN
CLAMANT BLAZING GLARING OBVIOUS
STRIDENT FLAGRANT
DOWNRIGHT CLAMOROUS SHAMELESS BAREFACED
VOCIFEROUS
CONSPICUOUS UNCONCEALED