Antonyms for the word "tenderizing" include toughening, hardening, and solidifying. Toughening refers to the process of making something harder or more resilient, while hardening refers to the process of making something more rigid or less pliable. Solidifying refers to the process of making something more compact or less flimsy. These antonyms are often used in cooking when preparing meat, where the meat is intentionally made tough, hard, or solid, rather than tender. They can also be used more broadly to describe any process that makes something less soft, yielding or malleable, such as in industrial processes, construction or engineering.