Category Nuances for toughness:

• mechanical,
• practical,
• physical,
• structural,
• distinctive,
• superior,
• desired,
• oriented,
• outstanding,
• metallurgical,
• required,
• beneficial,
• excellent,
• thermal,
• masculine,
• favorable,
• symbolic,
• desirable,
• up,
• measurable,
• attractive,
• pertinent,
• male,
• rubberlike,
• key,
• critical,
• good,
• significant,
• useful,
• fundamental,
• traditional,
• unique,
• advantageous,
• finished,
• plastic,
• tensile,
• rheological,
• intrinsic,
• valuable,
• individual,
• major,
• special,
• interesting,
• exceptional,
• main,
• inherent,
• novel,
• diverse,
• necessary,
• metal,
• protective,
• manly,
• concrete,
• important,
• working,
• technical,
• basic,
• defensive,
• sensory,
• vegetative,
• unusual,
• macroscopic,
• logical,
• new,
• sufficient,
• complementary,
• several,
• polymeric,

Simple Categories for toughness:

• property,
• characteristic,
• thing,
• quality,
• ability,
• attribute,
• trait,