fear and uncertainty about the future

worry, tension

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

trouble, inconvenience

(a cause of) great pain, discomfort or sorrow

pain, agony

the state of being very unhappy; great suffering (of mind or body); great misfortune

pain, mental or physical

a feeling of uneasiness considered as a warning (of danger etc)

feeling that an event is about to occur

a vague feeling that something (especially unpleasant or undesirable) is about to happen

anticipation, expectation

a question to be solved or decided, especially something difficult

difficulty; bad situation

a state of anxiety

anxiety, worry

(something that causes) the state feeling anxious or troubled

anxiety, trouble