What does tempered mean?
Tempered describes something whose intensity has been moderated or controlled. It is especially common in phrases such as a tempered response, a tempered argument, or a voice tempered with concern, where it indicates that emotion, severity, or enthusiasm has been reduced but not necessarily removed. The word can also have a technical meaning in metallurgy and glassmaking: tempered metal or glass has undergone controlled heating and cooling to improve properties such as strength and toughness. As the past tense and past participle of temper, it describes the act of moderating, blending, or strengthening something. For example, an observer might temper criticism with sympathy, while a smith tempers steel after quenching it. Although tempered is sometimes confused with tampered, the two words carry very different ideas: tempering regulates or strengthens through deliberate treatment, while tampering involves improper interference. Overall, tempered conveys restraint, balance, and controlled treatment.
Moderated, restrained, or softened; or strengthened through controlled heat treatment.
"The architect praised the building's bold design but tempered his praise with concerns about its cost."
The emotional sense is common in formal prose and discussion. The technical sense applies to materials such as steel and glass.
To moderate or soften something, or to heat and cool a material in order to change or strengthen its properties.
"She tempered her criticism with words of encouragement."
The emotional and material senses are both standard; the appropriate meaning depends on context.
The same word that calms an angry person also describes steel made tougher and less brittle by carefully controlled heat.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does tempered come from?
Tempered was formed in English with the suffix -ed from temper, with the original participial use developing into an established adjective. Temper entered English through Old French temprer, which derived from Latin temperare, meaning to mix, moderate, or regulate. The same Latin root also produced words including temperate, temperature, and temperament, reflecting the connected ideas of moderation, mixture, and measured character.
How tempered is actually used
In emotional and argumentative contexts, tempered is often slightly formal and suggests that strong feeling has been moderated rather than eliminated. In metallurgy and glassmaking, it is a technical term for a controlled heat-treatment process. Pronunciation and usage are broadly the same in British and American English.
Easily confused with tempered
Tempered means moderated, softened, or strengthened by controlled heat, whereas tampered means altered or interfered with improperly.