Now these three mates—Starbuck, Stubb, and Flask, were momentous men.
One way and another, it has begotten events so remarkable in themselves, and so continuously momentous in their sequential issues, that whaling may well be regarded as that Egyptian mother, who bore offspring themselves pregnant from her womb.
That odd sort of wayward mood I am speaking of, comes over a man only in some time of extreme tribulation; it comes in the very midst of his earnestness, so that what just before might have seemed to him a thing most momentous, now seems but a part of the general joke.
Looking over the side, they saw the before lifeless head throbbing and heaving just below the surface of the sea, as if that moment seized with some momentous idea; whereas it was only the poor Indian unconsciously revealing by those struggles the perilous depth to which he had sunk.
There are no more uses of "momentous" in the book.