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ineffective

Word family
in·ef·fec·tive /ˌɪnəˈfektɪv◂/ ●○○ adjectiveadj  
EFFECTIVEsomething that is ineffective does not achieve what it is intended to achieve 无效果的,不起作用的,不奏效的 OPP effective
ineffective in doing something
 The chemical was almost totally ineffective in killing the weeds.
这种化学品除杂草几乎一点用也没有。
ineffective against
 Various drugs have proved ineffective against the virus.
许多药物经证明都对这种病毒无效。
 an ineffective marketing campaign
一场毫无成效的营销活动
ineffectively adverbadv
ineffectiveness noun [uncountableU]
 the ineffectiveness of most diets
大多数节食的无效
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In everyday English, people usually say that something does not work rather than saying that it is ineffective: 日常英语中一般说do not work,而不说be ineffective
These drugs don’t work against bird flu.
这些药对禽流感无效。
Examples from the Corpus

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