sb is reckless, they do dangerous things without thinking about the consequences of their actions (a reckless driver)

if sb is persistent, they refuse to give up, despite difficulties or opposition

if sb is fickle, they are not faithful or loyal to their friends

if sb is volatile, they lose their temper very quickly and very easily

if sb is brash, they are annoyingly loud, over confident and aggressive

if sb is cantankerous, they are bad- tempered and tend to argue with people about insignificant things

if sb is sullen they are bad tempered and do not speak much

if sb is cheerful, they are happy and in a good mood

if sb is curt, they are very abrupt (and rude, as a result) when they talk to another person

if sb is met iculous, they are very careful about what they do, paying attention to small details and making sure that everything is correct or in order

if sb is inquisitive, they are always trying to find out about other people's lives, often by asking a lot of questions

interested in many different things and always wanting to know more about them (often used about children)