inefficacious
英 [,ɪnefɪ'keɪʃəs]
美
- adj. 无用的；无效果的
英英释义
- 1. lacking the power to produce a desired effect;
- "laws that are inefficacious in stopping crime"
英文词源
- inefficacious (adj.)
- 1650s, from in- (1) "not, opposite of" + efficacious. Related: Inefficaciously; inefficaciousness (1640s).