keyless
['ki:lis]
adj. 无键的；（钟表等）以转柄上发条的
反义词
参考例子
1.No more worries of key lost and locking the key in car, passive keyless entry, a small device makes a big revolution.
不再担心丢车钥匙或者将车钥匙锁在了车内，免钥入车系统这个小装置引发一场巨大革命。
2.The fitting of a keyless propeller on tail shaft cone is to make use of time contact friction between the mating surfaces for power transmission.
无销推进器安装于艉轴，是利用锥体表面接触，完全依靠摩擦阻力，在无滑动的情况下传递动力。
3.RFID (Radio Frequency Identification) door lock for keyless entry to a hotel room and other areas of the hotel is becoming more popular in hotels across the world.
无线电频率识别（RFID）门锁：被用于酒店房间或者酒店各个区域，这种趋势无论在酒店业还是在全世界都逐渐流行。
英文解释
adj.
1.lacking or not requiring a key
网络释义
keyless
无键的; 膜厚计｜无线传输型; 转柄上发条的;
Keyless System
无钥匙系统;
Keyless Go
无钥匙启动系统; 无钥匙启动; 无钥匙起动; 无匙启动;
Keyless entry
远程无线钥匙; 遥控锁; 无匙门禁; 无钥匙进入;
keyless coupling
无键联轴节;