1. Anna has been moping ever since she got the rejection letter from her first-choice college.

moping =

2. Mr. Jones met with the commission gracefully even though he was pressed for time.

commission =

3. The accused was acquitted in court because the evidence against him was weak.

weak =

4. Despite being rivals on the court, Sam and Max felt no hostility toward each other.

hostility =

Moping: is a verb that means moving slowly and being sad because of something that happened, in this case is because her first-choice college rejected her.

Commission: is a noun that means a group of people that was chosen for a specific task.

Weak: is a verb, in this case it means that there were not enough evidence or lack of it to prove what he did.

Hostility: is a noun that means being unfriendly towards someone, in the example Sam and Max are not unfriendly to each other when they are out of the court.

Moping = Brooding

Commission = delegation

weak = tenuous

hostility = enmity

Explanation:

The adjective brooding means "preoccupied with gloomy thoughts."

The noun delegation means "a group of people chosen to represent a larger population."

The adjective tenuous means "unsubstantial."

The noun enmity means "a feeling of ill-will."