📒 the quality of being solid, stiff and difficult to bend or break
📒 the fact of being full of difficulty and problems, especially because of a lack of money
📒 the quality of putting a lot of effort or energy into an activity
📒 the fact of needing or using a lot of physical strength or mental effort
📒 the fact of showing no kind feelings or sympathy
📒 the fact of being ready to fight and showing no signs of fear or weakness
📒 the fact of being difficult to do, understand or answer
📒 the quality in facts of being definitely true and based on evidence that can be proved
📒 the quality in water of containing calcium and other mineral salts that make mixing with soap difficult