Open-mouthed (adjective)

1. Describing a person or animal with their mouth open.
2. Describing a person or animal in a state of surprise or amazement.

Origin:

The word "open-mouthed" is a compound word, formed by combining the words "open" and "mouthed", it is used to describe a person or animal with their mouth open.

Examples:

1. She stared at him open-mouthed as he told her the news.
2. The dog was open-mouthed, panting in the heat.
3. He sat there open-mouthed, not knowing what to say.
4. The audience was open-mouthed as the magician performed his trick.
5. She looked at the painting open-mouthed, it was beautiful.