adamant
ad-a-mant / ăd-ə-mənt, ăd-ə-mănt
adjective 1. inflexible, unyielding They are decided only to be undecided, resolved to be irresolute, adamant for drift, solid for fluidity, all-powerful to be impotent. Winston Churchill, 1874 – 1965 noun 1. a legendary stone that was once considered so hard it was impenetrable, often identified with the diamond Habits, soft and pliant at first, are like some coral stones, which are easily cut when first quarried, but soon become hard as adamant. Charles Spurgeon, 1834 - 1892 2. a substance that is extremely hard The stream of Time, which is continually washing the dissoluble fabrics of other poets, passes without injury by the adamant of Shakespeare. Samuel Johnson, 1709 – 1784