Definition of the word deadly

The word "deadly" comes from the Old English word "deðlīc," which is derived from the words "death" and "like." The word "deadly" originally referred to something that was similar to death, or that had the potential to cause death. In its earliest uses, "deadly" was often used to describe poisons or other substances that were highly toxic and had the potential to cause death. Over time, the word "deadly" came to be associated with other dangerous or deadly things, such as weapons or diseases. In modern usage, "deadly" is often used to describe things that are extremely dangerous or lethal, such as deadly snakes, deadly viruses, or deadly force. The use of the term "deadly" in this context reflects the way that these things have the potential to cause death or harm, and are therefore to be feared and avoided.