The word "ante room" refers to a small room or lobby that serves as an entryway or waiting area. Some antonyms that can be used to describe the opposite of an ante room could be a spacious living room, a grand foyer, a massive hallway or an open entranceway. These terms suggest a more grandiose, open area with more space for guests to move around freely, whereas an ante room is typically smaller and more confined. Using antonyms can be a great way to communicate the kind of space or atmosphere you want your guests to experience when they enter your home or business.