'anxiety' definitions:

Definition of 'anxiety'

From: WordNet
noun
(psychiatry) a relatively permanent state of worry and nervousness occurring in a variety of mental disorders, usually accompanied by compulsive behavior or attacks of panic [syn: anxiety, anxiousness]
noun
A vague unpleasant emotion that is experienced in anticipation of some (usually ill-defined) misfortune

Synonyms of 'anxiety'

From: Moby Thesaurus