foisty

Example:He was irritable because of lack of sleep.

Definition:Readily annoyed or upset, especially at small things; easily provoked to anger or bad temper.

Example:The irascible old man rarely let anyone near him without provoking a fit of anger.

Definition:Easily angered or provoked; bad-tempered or grumpy.

Example:She was testy today, perhaps due to the bad traffic.

Definition:Moody and impatient, especially when overworked or tired; easily annoyed or irritated.