He is a con artist.
He believes false sources and instead of retracting statements, he insists he is right.
Climate Change, # of electoral votes, size of his inauguration crowd, murder rates, autism rates, frequency and sources of terrorist threats.
He is quick to say "I love WikiLeaks" when it suits him but then damns leaks when it doesn't and actually uses them to deflect questions about his involvement with Russia.
He's dangerous, incites hatred and misinformation, is a terrible role model, dishonest, untrustworthy, somewhat racist or unconsciously biased, rude, etc.
And it's a shame. I loved his stance on questions about his plans on reacting to Russia and his statements that the media coverage of this limits our negotiating leverage with Russia. I also agree on his hardline stance with trade deals, and to a lesser degree, on treaties.
But he is a pathological and dangerous troll.