Disguises are clothes or other objects that are designed to make someone look different from their true identity. Sometimes people use the word to refer to fake identities that they use to fool people.
To be rapt is to be deeply absorbed in something. When you are rapt in a movie, you are so involved in the story that you don't notice anything else around you.
Buttoned means that the buttons on your shirt are all closed. This is usually a sign that you are dressed formally.
To mutter is to speak low and slow, to speak in a low voice that is barely audible. When you mutter to yourself, you are usually thinking about something that is upsetting you.
To tearfully is to cry a lot. When she was tearfully hugging her mom, she was very emotional.
When someone is heartbroken, they are very sad and upset. They might feel like they can't breathe, or they might cry all the time.
To kneel is to bend down or to sit down on the ground with your knees bent. When you kneel, you are usually praying or worshipping.
Fracturing is when something breaks into small pieces. If you drop a glass, it might fracture.
To flutter is to move or flap your wings quickly. When a butterfly flutters its wings, it is trying to get air into and out of its lungs.