ineffective

Meanings

1. 1
   adj

   not producing an intended effect

   an ineffective teacher

2. 2
   adj

   Lacking in ability; incompetent or inadequate.

   Fire ants circumvented the problem of an ineffective sting by having an unusual and highly effective venom that when daubed or sprayed on other ants penetrates their waxy protective integumental barrier and kills or disables them.

3. 3
   adj

   lacking the ability or skill to perform effectively

4. 4
   adj

   lacking in power or forcefulness

5. 5
   adj

   Not having the desired effect; ineffectual; otiose.

Etymology

From in- + effective.