Unretained refers to something that is not kept or held back. Some synonyms for unretained might include free, unkept, unrestrained, unsaved, and unsecured. These words all suggest that something is not held back or retained in any way. Other synonyms for unretained might include unrestrained, unsecured, and unfettered. These words all suggest that something is not under control or is not held back by any external force. In general, synonyms for unretained are used to describe things that are not held back or under control, and often suggest a sense of freedom or release.