See also: gunmetal-grey English Noun gunmetal grey (countable and uncountable, plural gunmetal greys) A dark grey colour with a tint of blue; gunmetal. gunmetal grey: Alternative forms gunmetal gray (US) Synonyms gunmetal Derived terms gunmetal-grey (adjective) Translations Colour Maori: hinauri See also Appendix:Colors Wikiwand - on Seamless Wikipedia browsing. On steroids.