Antonyms for the word "over-burdened" include free, unencumbered, unfettered, unburdened, light, easy, uncomplicated, and unencumbered. Free means not subject to any obligations or restrictions. Unencumbered refers to a situation where something is free from any encumbrance or hindrance. Unfettered implies the absence of any binding constraints or hindrances. Unburdened means free from any burden or load. Light implies the absence of weight or heaviness, while easy refers to the absence of any difficulty. Uncomplicated means not complex or difficult. Unencumbered suggests the absence of any hindrance that could slow down a process.