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: honorable, balanced, fair, pale, trustworthy
pale

Category: type of rigidity 
Words: rigged, firm, unyielding, streamline, taut
streamline

Category: computers 
Words: firewall, file, schedule appointments, ram, motherboard

schedule appointments