Antonym: powerless. Similar words: power, empower, overpower, solar power, cheerful, empowerment, wonderful, subterfuge. Meaning: ['paʊə(r)fʊl] 
adj. 1. having great power or force or potency or effect 2. strong enough to knock down or overwhelm 3. having great influence 4. (of a person) possessing physical strength and weight; rugged and powerful 5. displaying superhuman strength or power. adv. (Southern regional intensive) very.
adj. 1. having great power or force or potency or effect 2. strong enough to knock down or overwhelm 3. having great influence 4. (of a person) possessing physical strength and weight; rugged and powerful 5. displaying superhuman strength or power. adv. (Southern regional intensive) very. 
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61. A powerful device exploded outside the station.
62. My PC isn't powerful enough to run that software.
63. Roy distills these messages into something powerful.
64. This could serve as a powerful lever for peace.
65. This was Sampras at his most powerful.
66. Cities have a powerful magnetizing effect on young people.
67. He elevated many of his friends to powerful positions within the government.
68. The opposition is getting ready to mount a powerful attack on the government.
69. Analysts warned that Europe's most powerful economy may be facing trouble.
70. Unfortunately, what could have been a powerful drama fell flat.
71. Reliving past experiences can release powerful feelings that have been pent up too long.
72. A deal between the two powerful institutions would have created a banking monolith. Sentencedict.com
73. There are bombs so powerful that whole nations could be wiped off the map by them.
74. For years the army was the most powerful political force in the country.
75. A baseball player who is not a speedy runner can compensate by powerful hitting.
76. They caved in the roof of the underground passage with powerful explosives.
77. People make cutting remarks to help themselves feel superior or powerful.
78. His powerful serve was too much for the defending champion.
79. This powerful drug is used to tranquilize patients undergoing surgery.
80. He is a powerful fellow, I can see, I shouldn't like to try conclusions with him.
81. At that moment Mrs. Jones's powerful voice interrupted them, announcing a visitor.
82. Ferries are very powerful and manoeuvrable compared to cargo ships.
83. The machine directs a powerful beam at the affected part of the body.
84. Several small businesses are planning to consolidate to form a large powerful company.
85. A powerful earthquake struck the Italian island of Sicily early this morning.
86. His speech was a powerful and trenchant attack against 〔 on 〕 apartheid.
87. This kind of fierce nationalism is a powerful and potentially volatile force.
88. It takes courage to press a charge against those who are powerful.
89. He was simply too powerful for his opponent, rocking him with a steady supply of left jabs.
90. Egypt was counted among the most powerful countries in the world.