Added 9 October 2026 firmness /ˈfɝmnəs/ noun Categories: Describing WordsRare Words In Latin: firmitās Wiktionary noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about firmness at Wordnik → Where our words come from → The muscle tone of healthy tissue. his muscular firmness The trait of being resolute. his resoluteness carried him through the battle The property of being unyielding to the touch. Related Words: steadinessresolutionresolutenesssoundnessresolveresolutesteadfaststeadfastnessstrictnessstringencytoughtenacity Back to today's word