Being fully assured of oneself

Secure, self-assured, proud

Being talented or gifted in some way 
Growing up in a loving, affirming environment 
Not being overly concerned with what others think; being happy with oneself 
Having faith in one's abilities to achieve one's goals 
Having experienced many successes in the past

Standing tall with the shoulders back
Looking people in the eye
Walking with purpose
Meeting challenges head-on
Not compromising when challenged or opposed
Trying new things
Good-natured flirting; friendliness
Facing change without fear or doubt
Being able to laugh at oneself: "Wow, I did a great job spilling the wine, didn't I?"
Learning from failure
Being assertive
Heading toward the center of a room, rather than staying at the edge
Having a strong work ethic
Congratulating others on their success
Initiating conversation with ease
Not being intimidated by someone's power, stature, or wealth
Striking out on one's own, if necessary
Knowing what one believes and standing firm on those values
Not being swayed by others
Not taking oneself too seriously
Curiosity
Asking for help when one needs it
Complimenting others; lifting them up instead of tearing them down
Seeing others as partners and mentors instead of competitors
Being socially adept
Accepting criticism with dignity
Focusing on the positive rather than the negative
Being open-minded
Finding solutions to problems instead of being stymied by them
Educating oneself so as to become more competent in a given area
Admitting when one has made a mistake
Acknowledging weaknesses while playing to one's strengths
Focusing on what is within one's control to change
Smiling
Taking compliments well
Not always knowing one's limitations

AMUSEMENT, CURIOSITY, EAGERNESS, HAPPINESS, SATISFACTION

Confident characters know who they are and what they're capable of. Because of their self-assurance, they don't fall into the trap of worrying about what others think. They aren't often threatened by people or difficult situations, instead seeing them as opportunities to grow and improve. Because confidence is such an enviable quality, others will naturally be drawn to the these characters.

Confident characters can be threatening to those suffering from insecurity, who may see them as cocky or conceited. Their confidence can indeed lead these characters to think too highly of themselves, causing them to look down on others and have difficulty connecting with them. Their self-assuredness can also compel them to overestimate their abilities, setting them up for failures that wash their confidence in self-doubt.

In The Hunt for Red October, Jack Ryan knows his stuff. He's an expert on naval intelligence and, specifically, Soviet Captain Marko Ramius. In his quest to prove Ramius' good intentions, he takes on the president's National Security Advisor, twice defies his fear of flying, and confronts Ramius himself, never doubting what he knows despite opposition by people in power. Other Examples from Film: John McClane (Die Hard), Jimmy Markum (Mystic River), Deloris Wilson (Sister Act)

Being in a scenario that reveals and magnifies one's Achilles' heel 
Experiencing a failure or tragedy that shakes one's confidence 
Encountering a problem that one is incapable of mastering 
Discovering that a personal achievement is a false victory due to another's meddling 
Encountering repeated failures that erode one's confidence

CATTY, FRIVOLOUS, HUMBLE, INSECURE, JEALOUS, MANIPULATIVE, NEEDY, OVERSENSITIVE, RECKLESS, SPOILED, SUSPICIOUS, TIMID, VAIN