Personality and character traits

impetuous

acts on a sudden idea without thinking first; often negative

impulsive

similar to impetuous, but can be used in a more positive way

effusive

gives exaggerated expression of pleasure, praise/gratitude

excitable

easily excited by things

pushy

always selfishly promoting one's own position or interests (informal)

self-conscious

nervous/uncomfortable bc you know what people think about you/your actions

well-balanced

calm and reasonable and showing good judgement

taciturn

reserved/says very little (negative)

diffident

lacks confidence

low self-esteem

has a low opinion of himself

reserved

not immediately sociable

aloof

unfriendly and not sociable

haughty

unfriendly and thinks herself better than others

disdainful

does not believe others deserve respect

(un)approachable

hard/easy to be sociable with/start a conversation with

conceited

thinks herself wonderful

self-important

has an exaggerated sense of her importance

modest

prefers not to exaggerate her own qualities

consienteous

always take their work very seriously

restless

not satisfied with what she is doing now and wanting something new

pig-headed

obstinate, but stronger (informal)