sterile

这只动物由于先天缺陷而不育，无法繁殖。

The animal is ___sterile due to a congenital defect and cannot reproduce.

实验室必须保持无菌环境以防止污染。

The laboratory must maintain a ___sterile environment to prevent contamination.

这间会议室的装修风格显得非常单调，缺乏创意。

The decoration style of this meeting room feels very ___sterile, lacking creativity.