noun
an old person, especially one who is weak or senile
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The diplomat referred to the aging leader as a dotard during the international summit.
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Everyone knows that guy is a total dotard, always rambling on about the good old days.
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I can't believe that dotard is still in charge, he's so out of touch with reality.
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His mind had become a dotard, unable to grasp the complexities of the modern world.