1. plural of firmness; the quality or state of being firm, solid, or not soft
Usage: typically used in abstract or technical contexts
2. plural of firmness; the quality of being resolute, steady, or unwavering in purpose or conviction

Examples

• The different firmnesses of the mattresses allowed customers to choose their preferred comfort level.
• Her firmnesses of character made her a natural leader.
• The architect specified various firmnesses of concrete for different structural components.
• Despite pressure, his firmnesses of conviction never wavered.
• The firmnesses of the soil varied across the construction site.
• Their firmnesses in negotiating the contract impressed all parties involved.