The sentence you gave is: "The jungle is a hot and rainy thick forest."
Let's check the grammar and make it easier to understand.
The sentence is almost correct but it sounds better if we add a comma or change the order a little. Here are two good ways to say it:
- The jungle is a hot, rainy, thick forest. (using commas to separate the adjectives)
- The jungle is a thick forest that is hot and rainy. (explaining the idea more clearly)
So, the main point is to put commas between the describing words (hot, rainy, thick) because they all describe the jungle. Or, explain the idea with more words.
In short, the sentence is mostly correct, but adding commas will make it sound better.