1. (Abstract Noun) A fixed and persistent intent or purpose; a firm decision এক দৃঢ় সিদ্ধান্ত

2. (Abstract Noun) the ability of being strong even under most adverse conditions অতি প্ৰতিকূল পৰিৱেশ বা অৱস্থাতো শক্তিশালী হৈ থাকিব পৰা গুণ

Different POS:

a. Proper Adj.-Common: firmstalwartstaunchঅচঞ্চলঅবিচল...
b. Proper Adj.-Masculine: patientতিতিক্ষুধৃতিমানধৈৰ্যশীলবৈয়াল...

Related Idea:

c. Abstract Noun: toleranceবৰদাস্তসহনশক্তিসহনশীলতাসহিষ্ণুতা...

3. Classical MechanicsStiffness or rigidity is the extent to which an object resists deformation in response to an applied force. The inverse of stiffness is flexibility or pliability: the more flexible an object is, the less stiff it is. Other terms with related meanings are compliance and elasticity. == Calculations == The stiffness, k, of a body is a measure of the resistance offered by an elastic body to deformation. For an elastic body with a single degree of freedom (DOF) (for example, stretching or compression of a rod), the stiffness is defined as k=Fδ where, F is the force on the body δ is the displacement produced by the force along the same degree of freedom (for instance, the change in length of a stretched spring) Stiffness is usually defined under quasi-static conditions, but sometimes under dynamic loading. In the International System of Units, stiffness is typically measured in newtons per meter (N/m). In Imperial units, stiffness is typically measured in pounds (lbs) per inch. Generally speaking... from wikipedia.org

4. (Abstract Noun) the quality or property of holding together firmly দৃঢ়ভাৱে একেলগে লাগি থকা গুণ বা ধৰ্ম৷