If you're talking about being noticeable:
* Unnoticeable: This directly contradicts being easily seen or attracting attention.
* Inconspicuous: This is a more formal synonym for unnoticeable.
* Discreet: This implies being careful not to attract attention.
* Hidden: This emphasizes being completely out of sight.
* Obscure: This suggests being difficult to see or understand.
If you're talking about being blatant:
* Subtle: This suggests being delicate or understated.
* Implicit: This refers to something understood without being stated directly.
* Covert: This means hidden or secret.
* Clandestine: This implies something done secretly, often for illegal or dishonest purposes.
If you're talking about being showy:
* Modest: This implies being humble and not wanting to attract attention to oneself.
* Simple: This suggests being plain and unadorned.
* Unassuming: This refers to someone who is not arrogant or pretentious.
The best opposite word for "conspicuous" will depend on the specific situation and the intended meaning.