Unsturdy is an adjective used to describe something that is unstable or shaky, often referring to furniture or buildings. Antonyms for the word unsturdy include stable, solid, sturdy, strong, and robust, which are all words used to describe something that is firm and secure. Another opposite of unsturdy would be durable, which implies something that is able to withstand wear and tear over time. Reliability and dependability are also antonyms of unsturdy, as they suggest something that is trustworthy and consistent. Therefore, when looking for the antonyms of unsturdy, you are essentially searching for words that indicate stability, robustness, durability, and dependability.