那位贵族有着典型的下巴后缩特征，看起来有些软弱。

The nobleman had a typical ___chinless appearance, which made him look rather weak.

那个富家子弟被大家私下称为没用的废物，因为他从不敢为自己的观点辩护。

Everyone privately calls that rich kid a ___chinless waste because he never dares to defend his opinions.