corkless

cork +‎ -less

corkless (not comparable)

1. Lacking a cork.
   • 1858, Hans Christian Andersen, The Bottle Neck:

     It did not see daylight again until it was unpacked, together with its comrades, in the cellar of a wine merchant; and then for the first time it was rinsed out — that was an odd sensation. It then lay empty and corkless, and felt strangely dull, as if it lacked something, though it didn't know what.

• rockless