Antonyms for the word "wobbliness" are stability, solidity, steadiness, firmness, and rigidity. Stability implies a state of being firmly fixed and not likely to move or give way. Solidity refers to a state of being firm and dense, without any hollow spaces or gaps. Steadiness implies a state of being steady, unwavering, and reliable. Firmness refers to a state of being hard, rigid or unyielding. Rigidity suggests stiffness and inflexibility in resistance to bending or change. These antonyms of wobbliness represent a sense of strength, immovability, and durability, which are the opposite of the wobbliness trait that is marked by instability and a lack of robustness or reliability.