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: moral characteristic 
Words: concise, frank, matter of fact, pork, blunt
pork

Category: aesthetic characteristic 
Words: pretty, probation, neat, fine, level
probation

Category: personal characteristic 
Words: unflappalbe, calm, confident, cool, relaxing

relaxing