undecreasing

From un- +‎ decreasing.

undecreasing (not comparable)

1. Not decreasing; growing no smaller.
   • 1851 November 14, Herman Melville, Moby-Dick; or, The Whale, 1st American edition, New York, N.Y.: Harper & Brothers; London: Richard Bentley, →OCLC:

     And what is still more, for many feet after emerging from the brain's cavity, the spinal cord remains of an undecreasing girth, almost equal to that of the brain.