What are the opposite words for out-of-door?

The word "out-of-door" refers to activities or things that are done outside or in the open air. The antonym for this word could be "indoor," which refers to activities that are done inside or within the confines of a building or structure. Other antonyms for "out-of-door" could include "domestic," "household," "sheltered," or "enclosed." These words all refer to the opposite of being outside, such as staying within the safety and protection of a home or structure. It's essential to understand both the word and its antonyms to achieve better communication skills.