Translation of "self-serving" into Portuguese

Something that was once so opaque, self-serving primitive, it is now a beacon of civic participation and progress.

Algo que era tão obscuro, egoísta e primitivo, agora é um marco de proatividade social e progresso.

What I do know is that every word that comes out of his mouth is a self-serving lie.

O que eu sei e que cada palavra que sai de sua boca e uma mentira interesseira.