The president was vehement in his speech to the crowd.
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Acting with great force; furious; violent; impetuous; forcible; mighty; as, vehement wind; a vehement torrent; a vehement fire or heat.,
Very ardent; very eager or urgent; very fervent; passionate; as, a vehement affection or passion.
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vehement means to express strong feelings.
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An antonym of vehement is indifferent.
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My request to chaperon the school dance was met with vehement
disapproval from my kids.