1. grump - Noun
2. grump - Verb
a bad-tempered person
Source: WordNetFocusing on the good isn't just about overcoming our inner grump to see the glass half full. It's about opening our minds to the ideas and opportunities that will help us be more productive, effective, and successful at work and in life. Shawn Achor
Saban was grump before Trump. Source: Internet
And what business was it of Herb Caen’s (I assume he was the famous late grump) where you went and what you ordered? Source: Internet
I am a total grump when it comes to YA love stories and they have to be really quite good for me to actually enjoy them. Source: Internet
The group of fellow travelers were fabulous, not a single grump in the bunch. Source: Internet
Tiny grump outside my front door. Source: Internet