'keyless' definitions:

Definition of 'keyless'

From: WordNet
adjective
Lacking or not requiring a key; "a keyless lock operated by a series of pushbuttons" [ant: keyed]

Definition of 'keyless'

From: GCIDE
  • keyless \keyless\ adj. lacking or not requiring a key; as, a keyless lock operated by a series of pushbuttons. Opposite of keyed. [WordNet 1.5]