lifeless

形容词 lifeless:

1. deprived of life; no longer living
   同义词：exanimate
2. destitute or having been emptied of life or living beings
3. lacking animation or excitement or activity
   同义词：dead
4. not having the capacity to support life

1. Lifeless, faultless.
   只有死人才不会犯错误。
2. It was a lifeless performance.
   那是一场死气沉沉的演出。
3. The scientists guess that Venus is lifeless.
   科学家猜测在金星上没有生命。

life.less

adj.（形容词）
Having no life; inanimate.
无生命的；无知觉的
Having lost life; dead.See Synonyms at dead
死的；失去生命的参见 dead
Not inhabited by living beings; not capable of sustaining life.
无生命的；不能维持生命的
Lacking vitality or animation; dull:
沉闷的；乏味的：
例句：
a lifeless party.
索然无味的社交聚会

【引伸】
life.lessly
adv.（副词）
life.lessness
n.（名词）