Difference between Abruptness and Curtness

ABRUPTNESS vs CURTNESS: NOUN

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

Sternness, Geniality, Facetiousness, Snottiness, Terseness, Pithiness, Tactlessness, Rudeness, Surliness, Tetchiness, Peevishness, Shortness, Abruptness, Brusqueness, Gruffness

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

Grumpiness, Churlishness, Sullenness, Geniality, Facetiousness, Snottiness, Terseness, Pithiness, Tactlessness, Surliness, Tetchiness, Peevishness, Shortness, Brusqueness, Gruffness

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?

The usual explanation is that translators unwittingly introduced an element of curtness, but this is simply not true.
With dawn still two bells away, Gruntle had roused him with uncharacteristic curtness.