assertive (adj.) behaving confidently and able to say in a direct way what you want or believe
- If you really want the promotion, you’ll have to be more assertive.
confident (adj.) certain about your ability to do things well
- I am confident that we can win this.
conscientious (adj.) feeling a moral responsibility to do your work carefully and to be fair to others
- he was a conscientious worker, and I’ll miss her.
considerate (adj.) thinking about the rights and feelings of other people : showing kindness toward other people
- a polite and considerate child
decisive (adj.) making choices quickly and surely, without having any doubts
- In an emergency, decisive action is called for.