curmudgeon

curmudgeon [ker-Muhj-uh n]

noun. a bad-tempered, difficult and cranky person

"In Pixar's Finding Dory, Hank is a cranky seven-limbed octopus who helps Dory for selfish reasons. Like all Pixar's best grouchy old curmudgeons, he's full of one-liners and hidden empathy."

"One of our neighbors is an old cranky woman who would scream at playing kids 'get off my lawn!' whenever they are near. She is a classic curmudgeon."

"Coffee drinkers can be thought of as curmudgeons, but research has actually linked regular java consumption to positivity."