Today, I am going to teach you some new, less common words that mean 'very big':

1. Gigantic (adj.) [pron. /jigantic/]
2. Enormous (adj).
3. Huge (adj) [pron. /hu:j/
4. Humongous (adj.) - informal mix of 3. and 2.
5. Ginormous (adj.) - another informal mix of 1. and 2.

Now, when you want to say 'very big' - you have some new vocabulary!

Example:
"The new building in Dubai is [enormous/huge/gigantic etc]!!"

Hope it's useful