very large numbers or amounts► huge/enormous · A huge number of people turned up for the demonstration.· Their profits are enormous.· Joan had very little money, and her hotel bill was huge.· Enormous sums of money were spent on the construction of the Channel Tunnel.
► vast use this about an amount, number etc that is so large that it cannot be easily measured: · The refugees arrived in vast numbers from villages all along the border.· Vast quantities of food and drink were consumed at the wedding.
► massive extremely large: · The system is capable of recording massive amounts of information.· Union leaders are warning of massive job losses.· The sums involved are massive -- over £12 billion in the first year alone.
► colossal use this about numbers or amounts, especially of money, that are extremely and surprisingly large: · Children are failing exams and dropping out of school in colossal numbers.
► whopping spoken informal a whopping sum of money or number is extremely large: · He managed to get a TV celebrity to open the theatre -- but at a whopping fee.· In the divorce proceedings, she demanded the car and a whopping two-thirds of the family business.
very large: 
a whopping fee