ineffective
1. [ adjective ] not producing an intended effect
Synonyms: ineffectual uneffective
Examples:

"an ineffective teacher" "ineffective legislation"

Related terms: effective unproductive toothless useless idle powerless inefficient inefficacious effectiveness
2. [ adjective ] lacking in power or forcefulness
Synonyms: unable ineffectual
Examples:

"an ineffectual ruler" "like an unable phoenix in hot ashes"

Related terms: impotent
3. [ adjective ] lacking the ability or skill to perform effectively; inadequate
Synonyms: inefficient
Examples:

"an ineffective administration" "inefficient workers"

Related terms: incompetent
Similar spelling:   ineffectively
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  invective
  infective
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  infection
  ineffectuality
  infectious
  infectiously