powerless

adj.

无力的，无能的；无权力的；虚弱的；无资源的

1. They were not always so powerless.
   他们不总是这么无力的。
2. It is a spiritual disease that leaves us weak and powerless.
   它是一种使我们软弱和无力的一种精神疾病。

Is the placebo powerless?
Is the placebo powerless?
Is the placebo powerless?
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Is the placebo powerless? An analysis of clinical trials comparing placebo with no treatment.
Is the Placebo Powerless? An Analysis of Clinical Trials Comparing Placebo with No Treatment - Brief Article
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Is the placebo powerless? Update of a systematic review with 52 new randomized trials comparing placebo with no treatment
Is the placebo powerless? An analysis of clinical trials comparing placebo with no treatment.[see comment][erratum appears in N Engl...
Speech style and impression formation in a court setting: The effects of "powerful"and "powerless"speech.