The term 'ADAPTED TO RIGORS' can be summarized by the crossword solution 'INURED', which means to become accustomed to something difficult or unpleasant. This term is often used to describe someone who has become accustomed to a difficult lifestyle or situation, such as a soldier who has become accustomed to the rigors of war. INURED can also refer to someone who has become accustomed to a certain level of hardship or difficulty.