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impetuous
acts on a sudden idea without thinking first (often negative)
impulsive
acts on a sudden idea without thinking first, but can be used in a more positive way
effusive
gives exaggerated expression of pleasure, praise or gratitude
excitable
easily excited by things
pushy
always selfishly promoting your own positions or interests; informal
self-concious
nervous or uncomfortable because you know what people think about you or your actions
well-balanced
calm and reasonable and showing good judgement
taciturn
reserved or says very little (generally negative)
introvert
inward-looking and quiet
outgoing
energetic and friendly, finds it easy to be with others
extrovert
outward-looking, energetic and sociable
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
unapproachable
not easy to be sociable with or start a conversation with
approachable
easy to be sociable with or 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
respectful
treating someone well and politely, often with admiration
naive
willing to believe simple things, perhaps because of inexperience
gullible
easily deceived
conscientious
always took his work seriously
restless
not satisfied with what she is doing now and wanting something new
obstinate
unwilling to change, despite persuasion
pigheaded
unwilling to change, despite persuasion, but stronger; informal