President Donald Trump may claim to 'know all the best words' but when it comes to using them in speech and the written word he comes bottom of the class.
New research looking at the speech patterns of the last fifteen U.S. Presidents finds the 45th speaks at the level of a fourth-grader - the worst since Harry Truman in 1945.
The analysis looked at the President's tweets as well as the spoken word with recent examples where Mr Trump proclaimed himself to be 'like, really smart,' typical of the colloquial style he is known for.
Factbase which studies President Trump's words claims The Donald has the worst vocabulary of any modern president despite him insisting on the opposite.
'I know words... I have the best words,' Mr Trump said one day in his superlative way.
Trump's bold claim was trashed after wordsmiths used various calculations by looking at the first 30,000 words spoken in office by each president which was then ranked on the Flesch-Kincaid grade level scale.
The words used by Trump were run through a variety of other lexicological analyses but the results were the same every time with The Donald always coming last.
Trump was found to use the fewest 'unique words' (2,605) of any president. He also uses the fewest average syllables. Obama was the most fluent using 4,869.
By every metric and methodology tested, Donald Trump's vocabulary and grammatical structure is significantly more simple, and less diverse, than any President since Herbert Hoover, when measuring 'off-script' words, that is, words far less likely to have been written in advance for the speaker,' Factbase CEO Bill Frischling wrote.
'The gap between Trump and the next closest president ... is larger than any other gap using Flesch-Kincaid. Statistically speaking, there is a significant gap.'
Newsweek reports that further tests analyzing English-language difficulty levels found Trump averaged languished around mid-fourth grade - well below Truman who spoke at nearly a sixth-grade level.
Presidents Herbert Hoover and Jimmy Carter came top of the list speaking at an 11th-grade level.
President Barack Obama placed third with a confident ninth-grade level of communication.
President Clinton spoke at a highly-respectable ninth-grade level, while George W. Bush was at a seventh-grade grammar level.
But Mr Trump would likely argue that intellectually he would come well above fourth-grade.
On Saturday morning he tweeted that he was elected to the presidency 'on my first try.'
'I think that would qualify as not smart, but genius....and a very stable genius at that!' He also tweeted: 'throughout my life, my two greatest assets have been mental stability and being, like, really smart.'
Later, at Camp David later he told how he was 'a very excellent student' and 'came out and made billions and billions of dollars ... ran for president one time and won.'
Despite such a relatively poor performance linguistically-speaking, researchers in found that the way Mr Trump speaks mirrors the average conversation - which connected with supporters.
Trump's language style wooed many voters into supporting his campaign.
'Trump's speech is appealing to many because it contrasts with the rehearsed style of other candidates,' Georgetown University linguist Jennifer Sclafani told DailyMail.com in 2016.
'His conversational style contributes to his overall image as a political outsider and as an 'authentic' candidate.'
Trump graduated from Wharton School, has written many New York Times bestsellers and is said to be worth $4 billion.
'Looking at these facts, one would think he would use structured sentences and have a large vocabulary, but his sentences are fragmented and very simple when addressing the masses during debates and rallies.
'Fragmented sentences are actually quite natural and common in everyday speech, regardless of what language a person is speaking or other factors like the geographical origin, social class, or educational background of the speaker,' said Sclafani.
'People take notice of Trump's fragmented sentences because they are less common in formal public speeches, which are often first written and rehearsed or read from a teleprompter.'
'When Trump speaks in public in a more conversational style, like in a victory speech or in a debate, he appears to many as a more relatable because he speaks in the way we all do in everyday life,' she said.
