Someone who is self-assured shows confidence in what they say and do because they are sure of their own abilities. He's a self-assured, confident negotiator.

What does it mean if your self assured?

English Language Learners Definition of self-assured

: having or showing confidence in yourself and your abilities.

Is self assured a good thing?

Under most circumstances, having self-confidence is a good thing. Confident people tend to be more successful in a wide variety of domains. It is this strong sense of confidence and self-esteem that allows people to go out in the world and reach for their goals.