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: emotional status 
Words: content, hearing, fine, happy, alert
hearing

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

Category: widespread 
Words: private, boring, regular, typical, general

private