WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a feeling of mild anxiety about possible developments
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
Word Usage
"This is the first time a direct relationship has been found without other psychological characteristics, such as anxiousness, that might affect results."