Meaning and usage of the word smooth in English

The word "smooth" has its roots in Old English, where it was spelled "smōþ" and meant "without roughness" or "even". This sense of the word comes from the Proto-Germanic word "*smuthiz", which is also related to the Proto-Indo-European root "*sewm-", meaning "to join" or "to bind". Over time, the meaning of "smooth" expanded to include notions of ease, calmness, and lack of disturbance. In the 14th century, "smooth" began to be used figuratively to describe a person's speech, behavior, or actions as being calm, gentle, and lacking in roughness or abrasiveness. Today, the word "smooth" has numerous connotations, including both literal (e.g., a smooth surface) and figurative (e.g., a smooth talker) meanings.