adjective, steel·i·er, steel·i·est.

consisting or made of steel.
resembling or suggesting steel, as in color, strength, or hardness.

Origin of steely

First recorded in 1500–10; steel + -y1
Related formssteel·i·ness, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for steely

Contemporary Examples of steely

Historical Examples of steely

Word Origin and History for steely

1580s, from steel (n.) + -y (2). Figurative meaning "hard and cold as steel" is from c.1500. Related: Steeliness.

Online Etymology Dictionary, © 2010 Douglas Harper