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: mild, equitable, unprejudiced, trustworthy, fair
mild

Category: aesthetic characteristic 
Words: fair, size, medium, dishonest, level
dishonest

Category: secretary duty 
Words: file, answer, type, prepare, program

program