Difference between Abruptness and Suddenness

ABRUPTNESS vs SUDDENNESS: NOUN

The state of being sudden.
The state or character of being sudden, in any sense; a coming or happening without previous notice.
The quality of happening with headlong haste or without warning

Angularity, Directness, Rapidity, Unexpectedness, Swiftness, Precipitousness, Precipitateness, Precipitancy, Precipitance, Shortness, Gruffness, Steepness, Brusqueness, Curtness, Suddenness

Directness, Immediacy, Alacrity, Shock, Unpredictability, Quickness, Ferocity, Vehemence, Unexpectedness, Rapidity, Swiftness, Precipitateness, Precipitancy, Precipitance, Abruptness

Forwardness, Vehemence, Terseness, Nonchalance, Angularity, Directness, Rapidity, Unexpectedness, Swiftness, Precipitance, Shortness, Gruffness, Steepness, Brusqueness, Curtness

Inevitability, Massiveness, Acuteness, Explosiveness, Directness, Alacrity, Shock, Unpredictability, Quickness, Ferocity, Vehemence, Unexpectedness, Rapidity, Swiftness, Precipitance

Lengthy sentences, abruptness, redundancy, superlatives and repetition, whether of words, observations or ideas, often lead to confusion.
May Young Lady and Furen overlook the aspect of the abruptness.
The abruptness of the sentence surrounds us with sudden light.
She came to the point with what Laura, who had accompanied her, thought was singular abruptness.
It only remains visible for a minute at the most, and then disappears with startling abruptness.
Is this sense of abruptness intentional or did you feel that the ending was musically appropriate?
It is an indirect representation of a direct one so to avoid abruptness.
Forgive my abruptness, but there is a delicate matter we need to discuss.
Red color is connected to nervousness, abruptness, instability and fickleness of feelings.
What does that abruptness looks like in action?

Cassius at Myndus, intending to surprise him by the suddenness of their attack.
With a suddenness that startled them all the wizard sprang to his feet.
He went off to bed with a suddenness that was almost disconcerting.
Additional two variables, outcome probability and suddenness, are adopted from Scherer.
It was the suddenness of this ghastly appearance that unnerved me.
When it is festivalized, revolution shuns gradual change for apocalyptic suddenness.
The University of Georgia was desegregated with unusual suddenness.
The suddenness of this outburst had made Alan jump.
Suddenness is the hallmark of a casualty loss.
University of Georgia was desegregated with unusual suddenness.