keyless ；

[例句] 现在许多螺旋桨都是无键的, 用液压来拆装. Now many propellers are keyless, so we install or remove a propeller by hydraulic pressure.

legless ；

[例句] 批评家,是教人跑步的无腿的人. A critic is a legless man who teaches running.

[医] lead-free ；

[例句] 请加满油. 无铅的. Fill her up. Unleaded, please.

[计] trouble-free ；

[例句] 电子邮件传输不可能被保证是安全或无错的. Email transmission cannot be guaranteed to be secure or error - free.

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[例句] 无定位调节作用所涉及的是这样一种调节机构,即它能停顿在其行程中的任意一处位置上. Floating action refers to a controlled device which can stop at any point in its stroke.

faithlessness，discredit ；

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[例句] 那是个明朗无雾的夜, 霜气凛人. It was a fine dry night, frost in the air.

having no norms，lawless，（没有限度） limitless ；

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[例句] 加热板为国内独一无三的整体形结构, 符合食品卫生要求和杜绝了加热了加热板的渗漏. The heating plate has unique unitary structure, meeting the requirement of food sanitation and avoiding its leakage.

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[例句] 迄无音信. We have received no information so far.

[医] agomphious，anodontous，edentate，edentulous ；

[法] unaware，unconscious，unintentional，involuntary，unmeant ；

anhidrosis，drysweating，nonsweating ；

[医]anodontia，edentulism ；

acathexis ；

acephalocyst ；

acrania ；

agalasisa，agalorrhea，agalactia，agalactosis ；

agamospecies ；

aglyphous ；