Meaning : Extraordinarily large in size or extent or amount or power or degree.
Example :
An enormous boulder.
Enormous expenses.
Tremendous sweeping plains.
A tremendous fact in human experience; that a whole civilization should be dependent on technology.
A plane took off with a tremendous noise.
Synonyms : enormous
Meaning : Extraordinarily good or great. Used especially as intensifiers.
Example :
A fantastic trip to the Orient.
The film was fantastic!.
A howling success.
A marvelous collection of rare books.
Had a rattling conversation about politics.
A tremendous achievement.
Synonyms : fantastic, grand, howling, marvellous, marvelous, rattling, terrific, wonderful, wondrous