The opposite of over-loaded is under-loaded or simply loaded. Loaded means that something is carrying an appropriate amount of weight, and is not overloaded or underloaded. An alternative antonym for over-loaded is light, which means that something is not carrying enough weight, and often refers to a feeling of emptiness or lack of substance. Unburdened is another antonym for over-loaded, which implies that something is free from the weight or burden that comes with being overloaded. Synonyms and antonyms are important tools in language learning, as they provide context and enhance understanding of words and concepts.