Antonyms for the word "most light toned" would include "darkest", "gloomiest", "murky", "dull", "grimy", "clouded", "shadowy", "dim", "gloomy", "bleak", "sombre" and "dreary". These words carry the opposite meanings of "most light toned", which is synonymous with "bright", "illuminated", or "luminous". While "most light toned" brings to mind images of sunshine, warmth and positivity, the antonyms evoke emotions of darkness, sadness and negativity. It is important to understand and use antonyms in writing and speech to convey a range of meanings and emotions more precisely.