1. superlative form of copery; most resembling, containing, or made of copper in color or quality
Usage: rare or nonstandard; 'coppery' is the standard adjective form, and 'most coppery' is the preferred superlative

Examples

• The copperiest tones in the sunset reflected off the lake.
• Of all the metals tested, this alloy had the copperiest hue.
• The copperiest leaves of autumn fell slowly to the ground.