adamantine
adjective
ad·a·man·tine
ˌa-də-ˈman-ˌtēn
-ˌtīn,
-ˈman-tᵊn
1
: made of or having the quality of adamant
2
: rigidly firm : unyielding
adamantine discipline
3
: resembling the diamond in hardness or luster
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Merriam-Webster unabridged
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