The term 'perdurable' is an adjective that describes something that is long-LASTING, ETERNAL, and INFINITE. It can be broken down into six crossword solutions: PERENNIAL (9 letters), LASTING (7 letters), ETERNAL (7 letters), INFINITE (8 letters), ENDLESS (7 letters), and ABIDING (7 letters). PERENNIAL refers to something that lasts for multiple years or seasons; LASTING implies something that continues for a long period of time; ETERNAL suggests something that has no end; INFINITE means something that has no boundaries; ENDLESS implies something that never stops; and ABIDING suggests something that is constant and unchanging. Together, these words describe the concept of perdurable, which is something that is everlasting and never-ending.