Prospectus and Disgruntled

What is the plural form of “prospectus”? Also, what is the opposite of “disgruntled”?

———- from Mary Cottage of Cedar Rapids, IA

More than one prospectus is referred to as “Prospectuses”. It’s a Portuguese word, meaning lots of plans, most of which will amount to nothing. The opposite of “disgruntled”, or the antonym as we say in grade school, is “happy”. Most Americans are highly disgruntled, but are so out of touch with their emotions that they actually assume they’re happy, when they are, in fact, just the opposite. That feeling you get when you go shopping for no reason and come home with something you never intended to purchase is miles closer to “disgruntled” than it is to “happy”.