Definition
Unscalable describes something impossible to climb or scale. It implies an insurmountable barrier, physically or metaphorically. Think of a sheer cliff face with no handholds, or a problem that seems impossible to solve. It suggests a lack of accessibility or the presence of a significant obstacle. Essentially, it's the opposite of 'ascendible' or 'scalable.' Therefore, unscalable things block progress and create limitations.