brittle

This term describes a specific type of fragility where a material does not bend or deform before breaking, but instead snaps suddenly. It carries a connotation of rigidity and lack of flexibility, often associated with age, coldness, or extreme dryness. When applied to human emotion or voice, it suggests a precarious state of composure. A brittle tone implies that the speaker is on the verge of a breakdown or an outburst, mirroring the physical property of something that looks solid but is actually ready to shatter under the slightest pressure.