The word "massiveness" is correct and usable in written English.
It is a noun that refers to a large size, amount, or extent. Example sentence: The massiveness of the ocean can be seen from a long distance away.
"It's massive," he says, then, lest he has understated the massive massiveness of massive, adds, "Fucking massive".
It really takes us back to Pynchon and all those — John Barth as well — who would write the massive novel, because the massiveness is some kind of a statement about completeness: to get it all in somewhere.
That covering needs to be massive to provide maximal protection, but that very massiveness would impede sensation, and so a preferential choice must be made between the conflicting demands.
In terms of the immediacy and sheer massiveness of impact on human thought and values, it would be difficult to find revolutions of comparable magnitude in human history.
A violent assault upon this point of view was launched by the Gothic Revivalists, who in the mid-19th century contended that the breathtaking counterpoise of a cathedral's flying buttresses was far more dramatically expressive of firmitas than the ponderous massiveness of its sturdy western towers.
In all archaic populations, facial massiveness and the size of premolars and molars were diminishing.
The massiveness of the interior highlands is also a significant factor; it gives rise to local anticyclones during the cold months of the year.
Niches and other indentations, projecting courses, or frames around openings suggest massiveness.
Baroque architecture as developed by Bernini, Carlo Maderno, Francesco Borromini, and Guarino Guarini emphasized massiveness and monumentality, movement, dramatic spatial and lighting sequences, and a rich interior decoration using contrasting surface textures, vivid colours, and luxurious materials to heighten the structure's physical immediacy and evoke sensual delight.
The surface textures also have more variety than the earlier sculptures, the artist by now having found how to enrich detail without sacrificing massiveness.
As builders of religious edifices mosques, schools, monasteries and, above all, tombs the Mamlūks endowed Cairo with some of its most impressive monuments, many of which are still standing; the Mamlūk tomb-mosques can be recognized by stone domes whose massiveness is offset by geometrical carvings.
