Discussion»Questions»Life and Society» Unsinkable. That was Molly Brown portrayed by Debbie Reynolds...a likeable gal. The Unsinkable Donald John floats too. Why?
1820, "one who habitually expects the worst" (Knowles' dictionary, 1835, defines it as "A universal complainer"), from 19c. French pessimiste (see pessimism).
Nihilist might work even better.
a : a doctrine or belief that conditions in the social organization are so bad as to make destruction desirable for its own sake independent of any constructive program or possibility