fear and uncertainty about the future

worry, tension

a person, thing, that causes trouble, worry or annoyance

trouble, inconvenience

a person, insect, thing, act etc that causes trouble or offence

annoyance; annoying person

a troublesome or destructive thing, animal etc; a child who is a nuisance

person or thing that presents problem

a question to be solved or decided, especially something difficult

difficulty; bad situation

a person who torments

person or thing that presents problem