Which of the following indicates a state of agreement or harmony?

The term "accord" is a word that signifies a state of agreement or harmony. It originates from the idea of two or more parties being in alignment or having a mutual understanding. When individuals or groups are said to be in accord, it suggests a sense of cooperation and a shared perspective. This can pertain to various contexts, such as personal relationships, negotiations, or even broader societal agreements, emphasizing the positive outcome of collaboration and consensus.

The other options convey different meanings: "amiss" indicates something that is not quite right or out of place; "adept" refers to being skilled or proficient in a particular area; and "aloof" describes a state of being distant or removed, often suggesting a lack of engagement or emotional connection. Each of these words diverges from conveying harmony or agreement, underscoring why "accord" is the most fitting choice for the question asked.