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: physical property 
Words: obese, heavy, area, chunky, fat
heavy

Category: emotional status 
Words: down, emotional upsets, disgusted, shameful, sliding
sliding

Category: shady activities 
Words: smear, fudge, molasses, falsification, smuggled

molasses