Solidity is a term used to describe something that is sturdy, durable and strong. It signifies a sense of reliability that something will not easily break or fall apart. Synonyms for the word "Solidity" include firmness, strength, stability, robustness, sturdiness, durability and soundness. These words indicate the ability of an object or material to withstand pressure or force without breaking or deforming. Other synonyms for solidity include security, dependability, coherence, steadiness, rigidity, and steadfastness. These words describe the traits of an object that can be trusted and relied upon. In summary, the array of synonymous words for solidity depict a sense of strength, dependability, and stability.