adamantine (suomeksi)

timanttinen (a: incapable of being broken / timanttinen / made of or as of diamond)
timantinkova (a: incapable of being broken / timanttinentimantinkova / hard as diamond / like a diamond / timantinkova / in hardness)
rikkomaton (a: incapable of being broken / timanttinentimantinkovarikkomaton / unbreakable)