n. An uneasy or disturbed state of mind; a feeling of slight alarm or apprehension; perturbation.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. feelings of anxiety that make you tense and irritable
Word Usage
"They are under a frightful apprehension of guilt and wrath, that they cannot enjoy themselves; when they seem settled they are in disquietude, when they seem merry they are in heaviness; like Cain, who always dwelt in the land of shaking."