Self-contained is a word used to describe something that is complete in itself and does not require any external help or involvement. Some synonyms for self-contained include independent, self-sufficient, autonomous, self-reliant, self-supporting, self-governing, and self-standing. These words convey the same concept of something or someone that is self-sustaining and self-sufficient. A self-contained object or system can operate efficiently without external assistance, while self-contained individuals are capable of managing their own affairs without relying on others. These synonyms help expand upon the meaning of self-contained and offer alternative ways to describe the same concept.