General opposites:
* Fragile: This is the most direct opposite, implying something easily broken or damaged.
* Weak: This refers to a lack of strength or firmness.
* Flimsy: This suggests something thin, light, and lacking in substance.
* Delicate: This implies something easily damaged or broken, often associated with beauty and fragility.
Opposites based on specific meaning:
* Unstable: If "sturdy" refers to something that is stable, the opposite would be unstable.
* Flexible: If "sturdy" refers to something rigid, the opposite could be flexible.
* Unreliable: If "sturdy" refers to something dependable, the opposite would be unreliable.
The best opposite for "sturdy" depends on the specific meaning in the context of your sentence.