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Related to firmness: firmness of purpose
firmnessnoun adherence, assurance, backbone, callosity, certainty, compactness, confidence, constancy, courage, determination, durability, endurance, fixedness, force, fortitude, hardness, high morale, immutability, inflexibility, intransigence, intrepidity, obstinacy, pertinacity, prowess, purpose, reliability, renitence, resoluteness, resolution, resolve, rigidity, rigor, security, solidity, soundness, spirit, stability, stanchness, staunchness, steadfastness, steadiness, stiffness, stoutness of heart, strength, substantiality, surety, temper, tenacity, toughness, unyieldingness
Foreign phrases: Firmior et potentior, est operatio, legis quam dispositio hominis.The operation of law is firmer and more powerful than the will of man.
See also: adherence, adhesion, certainty, constant, decision, force, inertia, loyalty, prowess, purpose, resolution, rigor, spirit, strength, surety, tenacity