Crotchety usually has a negative tone, suggesting annoyance with someone's behavior or attitude. When hungry, Jenna becomes crotchety and you should avoid her.
Pro Tip 2/3
Aging Stereotype
It's often used to describe older adults, but be careful not to stereotype as not all are crotchety. Just because he's a senior doesn't mean he's crotchety; he's actually very pleasant.
Pro Tip 3/3
Nonhuman Usage
Can describe things that cause annoyance, like a process or a machine, not just people. This crotchety printer never works when I need it most.