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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31. Some people believe that violence is an effective way of protesting.
32. The project looks at how we could be more effective in encouraging students to enter teacher training.
33. Tax incentives have been very effective in encouraging people to save and invest more of their income.
34. The press did a very effective hatchet job on her last movie.
35. Dark glasses are an effective shield against the glare.
36. Good customer relations require courtesy, professionalism and effective response.
37. The animal's markings provide effective camouflage.
38. The college has established an effective student support mechanism.
39. The campaign needs an effective coordinator.
40. She's a very effective teacher.
41. Effective crime prevention must be our main goal.
42. Many remedies effective in joint disease are primarily diuretic.
43. The government has already adopted effective measures against piracy.
44. The cut in interest rates is effective from Monday.
45. All managers should learn effective delegation.
46. The medicine is effective for knocking colds.
47. The medicine is effective against cancer.
48. Several airlines have proposed fare hikes,(sentencedict.com)[sentencedict.com] effective October 1.
49. The world desperately needs an effective WTO.
50. Creative activity serves as an effective antidote to depression.
51. The method / drug proved highly effective.
52. Humour is a more effective defence than violence.
53. Training is often much less effective than expected.
54. Good teamwork is a powerful tool for effective management.
55. Both musically and lyrically it is very effective.
56. The fear of ridicule is a very effective sanction.
57. The book aims to teach effective essay writing.
58. This method is effective enough with greenfly.
59. This country lacks an effective party of the centre.
60. Window locks are an effective deterrent against burglars.
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.