immeasurable

Etymology

From Middle English inmesurable, ynmesurable; equivalent to im- + measurable.

adj

1. impossible to measure
   Give me your hand, and in a few minutes we shall be in my own dwelling, amid those immeasurable deserts where only my story may be communicated. 1832, Letitia Elizabeth Landon, Heath's Book of Beauty, 1833, The Enchantress, pages 12–13
   There is also the former Great Central main line which, though it climbs to an almost equal altitude at Dunford, has the immeasurable advantage of electric traction. 1960 March, Cecil J. Allen, “Locomotive Running Past and Present”, in Trains Illustrated, page 175
2. vast
   "His contribution has been immeasurable," Bush said in a statement. "I value his judgment, and I treasure his friendship." 2007, Terence Hunt, “Longest-serving Bush aide resigns”, in Associated Press

noun

1. anything that cannot be measured
   And inspiring good relationships is all about immeasurables: it is about inspiring purpose, compassion and attentiveness. September 29, 2009, Madeleine Bunting, “Forget 'clients' and 'users' – public services are about people”, in Guardian