The term "filthy weed" can refer to many different types of unwanted plants. Some synonyms for this term include noxious weed, invasive plant, invasive species, weed infestation, and harmful weed. These plants can be harmful to the environment and can cause damage to other plants or animals in their ecosystem. In order to control the spread of these plants, it is essential to remove them as soon as possible. Many states and countries have laws that require the removal of invasive plants, and it is important to follow these guidelines in order to keep our environment healthy and thriving.