The adjective enormous describe something extremely large in size, scale or amount. Similar in meaning to vast, huge, and gigantic.

1. The children enjoyed their time at the zoo, and were particularly excited to see the enormous elephant.
2. The enormity of the occasion only struck Alice when she stepped out onto the pitch and saw the thousands of fans in attendance. 

1. Bringing the project in under budget was an enormous challenge for the team due to the many setbacks that they suffered.
2. We have put aside an enormous amount of money to finance research and development projects.
3. Our employees enormous dedication to getting this over the line has not gone unnoticed