The term "most freighted" implies a sense of heaviness, burden, or weightiness. Its antonyms would be words that convey lightness, ease, and simplicity. Some of the antonyms for "most freighted" include unencumbered, unfettered, light, carefree, unburdened, liberated, unfazed, relaxed, unconcerned, and easygoing. These words represent a sense of freedom and a lack of worry or distress. While, on the other hand, the word "most freighted" suggests a state of being weighed down and overburdened, these antonyms convey the opposite, representing a sense of lightness and ease in life.