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: physical activity 
Words: drop, fall, leaves, bend, exercise
leaves

Category: weather 
Words: fair, pale, 70, clime, tangle

pale