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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91. The lighting for the production made a very effective use of shadow.
92. He's an effective enough politician but somehow he lacks the statesmanlike gravitas of a world leader.
93. They have had effective control of the area since the security forces left.
94. Politically speaking, do you think that these moves have been effective?
95. Anyone who thinks this legislation will be effective is living in cloud cuckoo land.
96. The drug is very effective - the only snag is that it cannot be produced in large quantities.
97. Taking risks is the only way employees can provide effective and efficient customer service.
98. Although regularly pilloried by the press as an obnoxious loudmouth, he is, nonetheless[sentencedict.com], an effective politician.
99. In spite of what they are told, parents have no effective choice of schools.
100. The government said it wanted to overhaul the employment training scheme to make it cost effective.
101. One of the effective measures to minimize the dangers of driving is to teach people to obey all the rules of the road.
102. Needs assessment is crucial if the hospital is to deliver effective health care.
103. The drug is effective but has a tendency to cause headaches.
104. Strip lighting is very effective in offices, but it's too bright for the home.
105. The new rules will become effective in the next few days.
106. The initial image projected was of a caring, effective president.
107. The government should take effective measures to live through this economical crisis.
108. The new speed limit on this road becomes effective from 1 June.
109. MDT is an effective treatment and could cure all the leprosy sufferers worldwide.
110. The most effective new botanicals are extracts from cola nut and marine algae.
111. Empirical studies show that some forms of alternative medicine are extremely effective.
112. In order that training should be effective it must be planned systematically.
113. A united effort is always more effective than an isolated complaint.
114. Effective defence is a matter of intercepting their missiles before they can reach us.
115. A very effective mailing of product samples was carried out last year.
116. The President's speech was an effective apology for his foreign policy.
117. Her brother is the king, but she is the effective ruler.
118. When it is done properly, arts sponsorship can be more effective than advertising.
119. There was nobody strong enough to lead an effective countervailing force against the dictator.
120. Those anticancer drugs are effective, but also destructive to white blood cells.
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.