steel-blue

/S T IY1 L B L UW1/
noun
  1. 1

    A grayish shade of the color blue, like the metal steel

adjective
  1. 1

    Having or resembling this shade of blue

Synonyms

Source: https://en.wiktionary.org/wiki/steel%20blue, https://en.wiktionary.org/wiki/steel-blue