A ‣ Intellectual ability 
lots of ability | intelligent bright clever sharp shrewd able gifted talented brainy (informal) |
lacking ability | stupid foolish simple silly brainless daft dumb dim thick (the last four are predominantly informal words, and they can all be offensive) |
clever, in a negative way, using brains to trick or deceive | cunning crafty sly |
B ‣ Attitudes towards life 
Amal is pessimistic while Nia is optimistic - he always expects the worst to happen while she looks on the bright side.
It is strange that one of the twins is so extroverted while the other is so introverted - Ben loves being the focus of attention while Bill prefers to be alone with his thoughts.
I feel very tense ( or wound up / stressed out**) after a very busy day at work but, after a hot bath and a nice cup of tea, I'll soon feel relaxed.
Jane is very sensible - she'd never do anything stupid. In other words, she's very practical and down-to-earth.
Roberto is very sensitive - he gets very upset (or worked-up, more informal), if he feels people are criticising him.
C ‣ Attitude towards other people 
Enjoying others' company: sociable gregarious*
Disagreeing with others: quarrelsome argumentative
Taking pleasure in others' pain: cruel sadistic
Relaxed in attitude to self and others: easy-going even-tempered laid-back**
Not polite to others: impolite rude ill-mannered discourteous*
Telling the truth to others: honest trustworthy reliable sincere
Unhappy if others have what one does not have oneself: jealous envious
D ‣ One person's meat is another person's poison
Some characteristics can be either positive or negative depending on your point of view. The words in the right-hand column mean roughly the same as the words in the left-hand column except that they have negative rather than positive connotations.
positive associations | negative associations |
determined | obstinate stubborn pig-headed |
thrifty economical | stingy mean tight-fisted miserly* |
self-assured confident | self-important arrogant full of oneself** |
unconventional original | eccentric odd peculiar weird** |
frank direct open | blunt abrupt brusque curt |
broad-minded | unprincipled permissive |
enquiring* | inquisitive nosy** |
generous | extravagant |
innocent | naive |
ambitious | pushy** |
assertive | aggressive boss ** |
* These words are much more common in written than in spoken English.
** These words are much more common in spoken than in written English.