Usage Note
Muchísimo is the absolute superlative of mucho, intensifying to 'a great deal' or 'so much'. It agrees in gender and number when used as a determiner (muchísima gente), but stays invariable as a standalone adverb (me gusta muchísimo). Learners often confuse it with muy mucho, which is ungrammatical — use muchísimo alone.
Examples
"Me gusta muchísimo el chocolate."
Natural Translation
I like chocolate very much.
Literal Translation
To-me pleases very-much the chocolate.

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