Meaning of the word "self interested" in English

What does "self interested" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

self interested

US /ˌselfˈɪntərɛstɪd/
UK /ˌselfˈɪntrəstɪd/

Adjective

interested only in oneself; selfish

Example:
His decision was purely self-interested, with no regard for others.
A truly self-interested person will always prioritize their own gain.