adjective made hard or flexible or resilient especially by heat treatment.
— synonyms: treated, hardened, toughened
adjective adjusted or attuned by adding a counterbalancing element.
Examples
“Temper your language around children.”
“Tempering is a heat treatment technique applied to metals, alloys, and glass to achieve greater toughness by increasing the strength of materials and/or ductility. Tempering is performed by a controlled reheating of the work piece to a temperature below its lower eutectic critical temperature.”