1. Used to describe someone devoid of defining characteristics that might make a person interesting, extraordinary, or just simply worth devoting time or attention to.
2. Lacking intelligence and unable to socialize on even an elementary level.
3. Annoyingly frustrating because of the above.
Oh her? Don’t even worry about her, girl. She’s so basic.
I tried to get to know him, but after I spent 10 minutes with him, I realized he was too basic for me to waste time on.