More or less; a certain quantity or degree; a part, more or less; something.
"After waiting somewhat for the bus to arrive, we finally decided to walk home instead."
In plain English: There is no noun form of the word somewhat because it is only used as an adverb to mean "a little bit."
"The somewhat was not enough to convince her of his sincerity."
Usage: Use "somewhat" only as an adverb to mean "to some extent," not as a noun despite its archaic definition referring to a vague amount. In modern English, replace the outdated noun usage with specific quantifiers like "a little" or "some."
to a small degree or extent
"his arguments were somewhat self-contradictory"
"the children argued because one slice of cake was slightly larger than the other"
to certain extent or degree
"pretty big"
"pretty bad"
"jolly decent of him"
"the shoes are priced reasonably"
"he is fairly clever with computers"
To a limited extent or degree.
"The traffic was somewhat lighter than usual, allowing us to reach the city center in under an hour."
In plain English: Somewhat means a little bit or not completely.
"The soup was somewhat warm, but not hot enough to eat comfortably."
Something.
"The test was somewhat difficult, but I managed to pass it anyway."
Somewhat is a straightforward combination of the words some and what. It entered English as a natural way to express an indefinite or moderate degree.