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powerful

/ˈpaʊəfl/
adjective

  1. Having, or capable of exerting power, potency or influence.

  2. Large; capacious; said of veins of ore.

Synonymsforceful, mightful, mighty, powersome, strengthful, strong
Antonymspowerless, strengthless
adverb

  1. To a great extent or degree.

    "Not very many (of them) had been damaged."

    Similar: drastically, extremely, greatly

  2. Conforming to fact, reality or rule; true.

    Similar: actually, authentically, truly

  3. (with superlatives) Used to firmly establish that nothing else surpasses in some respect.

    "He was the very best runner there."

Synonymseminently, ever so, main, mighty, sore, swith

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