Bottle green is a deep, dark shade of green that is often associated with nature, growth and harmony. When it comes to antonyms for this color, there are several options. One antonym could be "bright," which would suggest a lighter, more cheerful hue. Another antonym could be "bare," which would imply a lack of color altogether. A third antonym for bottle green could be "ashy," which would describe a grayish, muted version of green. Ultimately, the right antonym for bottle green will depend on the context in which it is being used and the specific shade of green being referenced.