bad-tempered and gloomy

an experienced and trusted adviser

friendly association, especially with people who share one's interests

one who is industrious and diligent in carrying out tasks or duties; hard worker

a person who makes a new track, as a pioneer or innovator

praise enthusiastically

repeatedly ask (someone) to do something; pester

a student or trainee who works, sometimes without pay, at a trade or occupation in order to gain work experience

turning point

unlikely