1. Not producing an intended effect
   "an ineffective teacher"; "ineffective legislation"
   - uneffective, ineffectual 
2. Lacking in power or forcefulness
   - ineffectual, unable, effete 
3. Lacking the ability or skill to perform effectively; inadequate
   "an ineffective administration"
   - inefficient

See also: effectiveness, effectivity, effectuality, effectualness, idle, impotent, incompetent, ineffectively, ineffectiveness, inefficacious, inefficient, powerless, toothless, unproductive, useless

Antonym: effective

• garden forget-me-not
• garden heliotrope
• garden hose
• garden huckleberry
• garden lettuce
• garden loosestrife
• garden nasturtium
• Garden of Eden
• garden orache
• garden party
• garden pea
• garden pea plant
• garden pepper cress
• garden pink
• garden plant
• garden rake
• garden rhubarb
• garden rocket
• garden roller
• garden snail
• garden sorrel
• garden spade
• garden spider
• Garden State
• Garden Stater