Antonym: ineffective. Similar words: effectively, effectiveness, effect, in effect, take effect, affection, the greenhouse effect, affectionate. Meaning: [-tɪv] 
adj. 1. producing or capable of producing an intended result or having a striking effect 2. able to accomplish a purpose; functioning effectively 3. works well as a means or remedy 4. exerting force or influence 5. existing in fact; not theoretical; real 6. ready for service.
adj. 1. producing or capable of producing an intended result or having a striking effect 2. able to accomplish a purpose; functioning effectively 3. works well as a means or remedy 4. exerting force or influence 5. existing in fact; not theoretical; real 6. ready for service. 
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61. It's an extremely effective cure for a headache.
62. The company has no effective machinery for resolving disputes.
63. What makes a TV programme politically effective?
64. Plainly the laws are not effective.
65. In effective classrooms the teacher provided clear direction.
66. Diets are most effective when combined with exercise.
67. Sneezes are devastatingly effective at spreading infection.
68. This is an effective piece of writing.
69. In order that training be effective ...
70. He has now taken effective control of the country.
71. Cooperative activity is essential to effective community work.
72. Team captains need to have effective man-management skills.
73. Yoga is a very effective technique for combating stress.
74. My resignation is effective from May 1.
75. They have thought out the effective saving.
76. The green movement lacks effective representation in Parliament.
77. The foam operates as a very effective filter.
78. Advertising is often the most effective method of promotion.
79. Simple antibiotics are effective against this organism.
80. The book has a very effective closing chapter.
81. The new laws will become effective next month.
82. The rebels are in effective control of the city.
83. Gentle persuasion is more effective than force.
84. All these techniques are equally effective.
85. We need an effective Opposition.
86. She said this would allow more effective planning.
87. There is no effective deterrent for these young criminals.
88. Give delay charge to ought to be in its are effective the amortize inside economic life,[http://sentencedict.com/effective.html] the amortize that our country sets period do not exceed 10 years.
89. Their military capability has been reduced because their air force has proved not to be effective.
90. Fitting a burglar alarm is the most effective way to increase home security.
More similar words: effectively, effectiveness, effect, in effect, take effect, affection, the greenhouse effect, affectionate, detective, objective, subjective, perspective, protective, collective, collectively, irrespective, respectively, retrospective, irrespective of, affect, affectation, infection, active, actively, deductive, addictive, proactive, productive, afflictive, hyperactive.