"Not lumbered" can be replaced by several synonyms such as unencumbered, unburdened, unladen, unhampered, or unobstructed. These terms all imply a lack of weight or burden, whether physical or metaphorical. For example, an unencumbered path is free of obstacles or barriers, while an unburdened mind is relieved of worries or concerns. Similarly, an unladen truck does not carry any weight, and an unobstructed view is clear and without obstructions. When we use these synonyms, we help express a sense of freedom, lightness, and mobility. And by avoiding the word "lumbered," we avoid suggesting that something is cumbersome, awkward, or difficult to move.