What adjective describes a trait of being easily broken or delicate?

The term that describes a trait of being easily broken or delicate is "brittle." This adjective specifically refers to materials or objects that lack flexibility and can break or shatter under stress or pressure. For instance, glass is a common example of a brittle material; it can easily fracture if subjected to a hard impact. This concept is often applied in various contexts, including engineering, geology, and even in describing certain personality traits metaphorically, where someone may be described as brittle if they are sensitive or easily upset.

The other terms do not convey the same meaning. "Brash" refers to being bold or audacious, often in a rude or self-assertive manner. "Benign" describes something that is harmless or gentle, typically in a medical context, indicating a condition that is not life-threatening. "Callous" means showing an insensitive or cruel disregard for others, which is unrelated to the physical trait of being fragile or delicate. Thus, "brittle" is the most fitting adjective for describing something that is easily broken.