vendor
A. those businessmen who sell vegetables
B. a person who is buying something or who intends to buy it.
temperament
A. feelings and emotions that people have in particular situations.
B. the tendency to behave in an uncontrolled, bad-tempered, or unreasonable way.
volatile
A. be likely to change suddenly and unexpectedly.
B. one that will quickly change into a gas
undesirable
A. those who have harmful effects.
B. something or someone that are unpopular