1. most resembling steel in hardness, strength, or color
Usage: superlative form of steely
2. most cold, harsh, or unfeeling in manner or expression
Usage: superlative form of steely

Examples

• Her steeliest glare silenced the entire room.
• The CEO’s steeliest decision was to close three factories.
• He showed his steeliest resolve during the crisis.
• The knife had the steeliest blade I’d ever seen.
• Her steeliest gray eyes revealed no emotion.
• The general’s steeliest orders came during wartime.