1. a bad-tempered, difficult, cantankerous person

Examples

• The old curmudgeon complained about everything from the weather to the neighbors’ music.
• Despite his reputation as a curmudgeon, he secretly donated money to local charities.
• She called her grandfather a lovable curmudgeon because he grumbled but had a good heart.
• The curmudgeon at the corner store never smiled at customers.
• He’s become quite the curmudgeon in his old age, always finding fault with modern technology.
• The neighborhood curmudgeon yelled at kids to stay off his lawn.