Definition of "unscalable" [unscalable]

• Not scalable. (adjective)

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• "This rock face could scarcely be described as unscalable, because it was so rough that, although practically vertical, the projections on it were so numerous and pronounced that an active man could climb it without much difficulty, if uninterfered with; but if the summit and flanks happened to be held by even a small force of men armed with rifles, to climb it would at once become an absolute impossibility."
• "Soon, in-the-trenches anti-poverty practitioners with long experience, community-based organizations close to their clients, market-based programs with real revenues and real customers, and experimental, innovative initiatives with great promise may be written off as woolly-headed, undisciplined or unscalable simply because they are un-evaluated."
• "They are a boundary, a dividing line, a wall impregnable and unscalable."