1. In an ineffective manner
   "he dealt with the problem rather ineffectively"
   - inefficaciously

See also: ineffective

Antonym: effectively

• obtuse
• obtuse angle
• obtuse leaf
• obtuse triangle
• obtuse-angled triangle
• obtusely
• obtuseness
• obverse
• obvert
• obviate
• obviating
• obviation
• obvious
• obviously
• obviousness
• oca
• ocarina
• Occam
• Occam's Razor
• occasion
• occasional
• occasionalism
• occasionally
• occasions
• occident