keyless [
'ki:lis]
a. 无键的, 不用钥匙上发条的
keyless[ adj ]
lacking or not requiring a key
<adj.all>
a keyless lock operated by a series of pushbuttons
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]