Opaca (en. Opaque)
/oˈpaka/
Slang Meanings
To describe someone who is not sincere or who hides something.
That guy is very opaque; he never says what he really thinks.
Ese tipo es muy opaco, nunca dice lo que realmente piensa.
To refer to a situation that is confusing or unclear.
The negotiation was opaque; I struggled to understand the terms.
La negociación fue opaca, me costó entender los términos.