uneffective

1. Not producing an intended effect (synset 300839148)
   "an ineffective teacher"; "ineffective legislation"
   also:

   • idle - not in action or at work
   • inefficacious - lacking the power to produce a desired effect
   • inefficient - not producing desired results; wasteful
   • powerless - lacking power
   • useless - having no beneficial use or incapable of functioning usefully
   tells us about: effectiveness, effectivity, effectuality, effectualness - power to be effective; the quality of being able to bring about an effect
   similar to:

   • toothless - lacking necessary force for effectiveness
   • unproductive - not producing desired results
   same as: ineffective, ineffectual

Other Searches

• Rhyme: Dillfrog, RhymeZone
• Definition: Wiktionary, Dictionary.com, Wikipedia, Merriam-Webster, WordNet, Power Thesaurus
• Imagery: Google, Flickr, Bing