👉 Thinner refers to a person who is slim, typically characterized by being short compared to their height or with a body mass index (BMI) below 18.5. This can be due to genetics, lifestyle factors, or both. Thinners are often associated with a lack of muscle tone and tenderness in the muscles, which makes them appear thin. They may also have small lips, flat forehead, and flat nose. Thinners may also have a more slender build compared to their peers