
Curmudgeon
Negative Connotation
The term 'curmudgeon' has a negative tone and suggests unpleasant behavior. 
Older Characters
Often used to describe older people, implying stubbornness or a set-in-their-ways attitude. 
Not Always Literal
'Curmudgeon' can be used humorously or affectionately for someone who's only occasionally grumpy. 