The word "most stretched" implies maximal extension, elongation or expansion. On the other hand, the word "most contracted" can be used as an antonym to describe the opposite of stretched, meaning the act of compressing or shrinking in size or length. Another possible antonym is "most relaxed" which refers to being at ease or in a comfortable position, without any tension or pressure in the body or mind. Alternatively, we can use "most compact" to suggest a state of being tightly packed or condensed, as opposed to "most stretched" which is more dispersed or spread out. Lastly, "most shortened" can be used as an antonym, describing a reduction in length, distance, or duration compared to when it is stretched.