half-finished

From half- +‎ finished.

half-finished (not comparable)

1. Only partially completed, being approximately at the halfway stage.
   • 1951 December, Michael Robbins, “John Francis's "History of the English Railway"”, in Railway Magazine, page 800:

     As we contemplate the half-finished arterial roads and electrification plans of our own age, and the town-planning schemes that gather dust in the public libraries, we can admire the drive and action of the railway pioneers.

• half-built
• unfinished

• “half-finished”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.