Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.

Category: emotional status 
Words: down, emotional state, loveful, ashamed, flat
flat

Category: chocolate food 
Words: brownie, loosen, chocolate cake, fudge, molasses
loosen

Category: consumer product 
Words: disappointed, jewelry, service, content, thing

disappointed