indestructible
/ɪndɪˈstɹʌktɪbəl/ adjective C1- Not destructible; incapable of decomposition or of being destroyed; invincible.
From the library
“But,” she exclaimed, suddenly, “arsenic is indelible, indestructible; in whatsoever way it is absorbed, it will be found again in the body of the victim from the moment when it has been taken in sufficient quantity to cause death.”
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