The task is to identify the word with a different connotation from the others. 'Dirty', 'Shabby', and 'Filthy' all have negative meanings related to being unclean, unkempt, or in poor condition. 'Dandy', however, means fashionable, elegant, or well-dressed - a positive term. Therefore, 'Dandy' is the odd one out because it has a positive connotation of being stylish, while the other three words all denote dirtiness or unkempt appearance.