PAIN IN THE NECK

an irritating, annoying person

LONE WOLF

someone who prefers his own company and does not like socializing. We can also say a lone bird.

MOANING MINNIE

a person who complains a lot about insignificant things.

WET BLANKET

a person who ruins other people’s fun by staying pessimistic and complaining all the time.

ROLLING STONE

a person who moves from place to place, job to job, without staying anywhere long

WALLFLOWER

a shy person, usually a girl who has no one to talk to or dance with at a party

Also Read – Vocabulary differences between British and American English