1. Not producing an intended effect
   - ineffective, uneffective 
2. Producing no result or effect
   "the therapy was ineffectual"
   - futile, otiose, unavailing 
3. Lacking in power or forcefulness
   "an ineffectual ruler"
   - ineffective, unable, effete

See also: effectiveness, effectivity, effectuality, effectualness, idle, impotent, ineffectually, ineffectualness, inefficacious, inefficient, powerless, toothless, unproductive, useless

• arrow arum
• arrow grass
• Cheever
• cheewink
• chef
• chef's salad
• chef-d'oeuvre
• Cheilanthes
• Cheilanthes alabamensis
• Cheilanthes eatonii
• Cheilanthes gracillima
• Cheilanthes lanosa
• cheilitis
• cheiloschisis
• cheilosis
• Cheiranthus
• Cheiranthus allionii
• Cheiranthus asperus
• Cheiranthus cheiri
• Chekhov
• Chekov
• chela
• chelate
• chelate compound
• chelated