Definition of "worrywart" [worrywart]

• One who worries excessively and needlessly. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "And yesterday, Sunday, I lamented that going to the movies has become much less of a pleasure for me these days and more of an exercise in worrywart-ism."
• "Ed Helms, who played the worrywart dentist in "The Hangover," is Tim Lippe, an insurance agent in small-town Wisconsin."
• "Still, even that slim of a chance could be slightly disconcerting seeing that the pesky asteroid that hit the Earth 250 million years ago was likely the cause of 90 percent of life on the planet dying off also, as a worrywart points out to me, those are better odds than winning the lottery."