Choose the option opposite in meaning to the word or phrase underlined. The children's room was messy when we entered.

To find the word opposite in meaning to "messy," we first need to understand what "messy" means. The word "messy" suggests disorder, lack of neatness, or organization. A messy room is one that is cluttered and possibly untidy.

Now, let's analyze the given options:

• Muddled: This word also implies confusion or disorder, similar to "messy."
• Tidy: This word means neat, orderly, and clean. It is the opposite of "messy." A tidy room is well-organized and free of clutter.
• Dirty: Although dirty implies uncleanliness, it doesn't necessarily mean disorganized. A room can be dirty yet still have some degree of order.
• Unkept: This word suggests negligence and lack of care, which can overlap with messy but does not clearly mean the opposite.

Based on this analysis, the opposite of "messy" is tidy because it represents neatness and organization, which directly contrast to disorder and clutter.