What Is The Meaning Of Dotard?

The leader of North Korea has introduced a lot of people to an interesting new word.
In response to Donald Trump’s UN General Assembly speech, in which the US president threatened to “totally destroy” the country, Kim Jong-un made a rare statement to call Trump a “mentally deranged dotard.”
The term got people scrambling for a dictionary to look up what the word could possibly mean.Kim Jong Un calls Trump a mentally deranged U.S. dotard. Searches for 'dotard' are hi