curmudgeon

noun2

1. •
   An ill-tempered person full of stubborn ideas or opinions, often an older man.

   • There's a cranky curmudgeon working at the hospital who gives all the patients and other doctors flak.
   • John Doe's old age and stubborn aversion to new ideas make him a curmudgeon of a candidate.
2. •
   (no longer used) A miser.