Inured (to) means to become accustomed to something, usually something unpleasant. It is derived from the Latin word 'INURED' which means to be hardened or toughened. The term is often USED in reference to people who have become accustomed to a certain situation or environment, such as soldiers who have become accustomed to the horrors of war. The crossword solution for this term is USED, which is a four letter word that means to put into action or practice.