The opposite of "柔软" in English is "stiff". When we think of something that is stiff, we imagine something that is hard, rigid, and inflexible. For example, a piece of wood or a metal rod is stiff because it doesn't bend easily. Stiffness can also describe a person's posture or movement, if they are not relaxed or fluid in their movements.

Stiffness can have negative connotations, as it can imply a lack of adaptability or creativity. In contrast, something that is soft and flexible can be seen as more versatile and adaptable. For example, a piece of fabric that is soft and pliable can be used to create a variety of shapes and designs.

In some contexts, stiffness may be desirable, such as in engineering or construction, where a certain level of rigidity is necessary for stability and durability. However, in other contexts, such as interpersonal relationships or artistic expression, being too stiff can hinder communication and creativity.

Therefore, while stiffness may have its uses, it is important to also embrace softness and flexibility in order to be adaptable and open to new possibilities.