Unregimented is a word that implies a lack of structure or conformity. Some synonyms for unregimented include unstructured, unsystematic, disorganized, freeform, spontaneous, uncontrolled, and free-spirited. These words all suggest a sense of independence and doing things in a way that is not bound by rules or expectations. An unregimented approach can be refreshing, allowing for creativity and innovation. However, it can also lead to chaos and unpredictability. Depending on the context, using synonyms for unregimented can add nuance and variety to your language while still conveying the same idea.