The adverb too - English Grammar
https://www.englishgrammar.org/adverb05.12.2010 · Too is an adverb. It is used before adjectives without nouns and before adverbs. I arrived too late. You are too generous. Too and too much Too much cannot be used before adverbs and adjectives without nouns. She is too fat. (NOT She is too much fat.) Too with other determiners Too is not normally used before adjective + noun.