unscalable

• unscaleable

From un- +‎ scalable.

unscalable (not comparable)

1. Not scalable, that cannot be climbed.
   • 1611 April (first recorded performance), William Shakespeare, “The Tragedie of Cymbeline”, in Mr. William Shakespeares Comedies, Histories, & Tragedies  (First Folio), London: Isaac Iaggard, and Ed Blount, published 1623, →OCLC, :

     […] Remember, sir, my liege,
     The kings your ancestors, together with
     The natural bravery of your isle, which stands
     As Neptune’s park, ribbed and paled in
     With rocks unscalable and roaring waters,
     With sands that will not bear your enemies' boats,
     But suck them up to the topmast. […]

   • 1822, [Walter Scott], chapter II, in The Pirate. , volume II, Edinburgh: [James Ballantyne and Co.] for Archibald Constable and Co.; London: Hurst, Robinson, and Co., →OCLC:

     The other end of their promenade was closed by a lofty and almost unscaleable precipice,the abode of hundreds of sea-fowl of different kinds […]

   • 1903, W. E. B. Du Bois, The Souls of Black Folk, I. Of Our Spiritual Strivings,

     Why did God make me an outcast and a stranger in mine own house? The shades of the prison-house closed round about us all: walls strait and stubborn to the whitest, but relentlessly narrow, tall, and unscalable to sons of night who must plod darkly on in resignation, or beat unavailing palms against the stone, or steadily, half hopelessly, watch the streak of blue above.

2. Not scalable, that cannot be changed in scale.
   • 2013 January 7, Patrick Metzger, “Public Works: Vertical Farming”, in Torontoist:

     The idea has its detractors. Skeptics argue the whole idea is unscalable, and that large vertical farms would be insatiable consumers of energy to keep the plants lit, healthy, and harvested […]

   • 2016 March 7, Adir Shiffman, “Beware a ‘barbell bubble’ in tech as investor demand outstrips startup supply”, in The Australian Financial Review:

     The result is a marketplace where low-revenue companies (say zero to $2 million per annum) are attracting valuations in the tens of millions of dollars and raising too much money. Most of these businesses will turn out to be poorly run, not special, unscalable, and will not deliver negative returns.