* Solitude: This is a direct opposite, as retinue implies a group of people accompanying someone, while solitude implies being alone.
* Isolation: Similar to solitude, this emphasizes the lack of a supporting group.
* Independence: This emphasizes the ability to act without the assistance of others, the opposite of relying on a retinue.
* Self-reliance: Similar to independence, this suggests the ability to manage without the support of others.
* Minimalist: This suggests a small or nonexistent entourage, the opposite of a large and impressive retinue.
The best antonym will depend on the specific situation and the nuance you want to convey.