In this case, very is an adverb.
A very hot day is usually 97 degrees Fahrenheit or higher to be considered very hot. However, 'very hot days' usually pertain to a certain area where the temperature is higher than normal.
hot tub
a swim on a very hot day cools the body
A desert is a dry environment; it is very hot in the day and very cold at night
very hot during the day as it is the closest planet to the sun =]
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A synonym for "very fast" is quick.
hot
hot
"hot season"
Very.