nervous

Up until recently, habituation -- a simple form of learning -- was deemed the exclusive domain of complex organisms with brains and nervous systems, such as worms, insects, birds, and mammals.

Opponents and economists said that by striking down the proposed minimum-wage increase, voters signaled that they were nervous about businesses raising prices to offset their added labor expenses.

When pain signals are passed along the nervous system, proteins called calcium channels play a key role.

The prince plays the part of a nervous customer as he faces the prospect of getting a first tattoo from US singer Jelly Roll.

This is the project I’m most nervous to see.