The dog must not be timid, shrinking behind its master or handler; it should not be nervous, looking about or upward with anxious expression or showing nervous reactions, such as tucking of tail, to strange sounds or sights. (samthedogtrainer.com)
Short term, the market drop may be just a nervous reaction, hard to say how big though. (jaredbernsteinblog.com)
For physical science you have in these lives merely ordinary examples of the operation of the principles of physiological chemistry, and of the dynamics of nervous reactions: for religion you have lives of the most profound significance in the history of the world. (religion-online.org)