Difference between Sudden and Abrupt

SUDDEN vs ABRUPT: NOUN

Characterized by sharp change in elevation; precipitous.
Happening or done without delay; hasty or immediate.
Happening without warning or in a short space of time
Happening without previous notice or with very brief notice; coming unexpectedly, or without the common preparation; immediate; instant; speedy.
Hastly prepared or employed; quick; rapid.
Hasty; violent; rash; precipitate.
Happening quickly and with little or no warning, snell.
Happening without warning; unforeseen.

Surprisingly and unceremoniously brusque in manner
Marked by sudden changes in subject and sharp transitions
Suddenly terminating, as if cut off.
Having sudden transitions from one subject to another; unconnected.
Without notice to prepare the mind for the event; sudden; hasty; unceremonious.
Broken off; very steep, or craggy, as rocks, precipices, banks; precipitous; steep.
Terminating suddenly rather than gradually; truncate.
Touching on one subject after another with sudden transitions.
Surprisingly curt; brusque.
Unexpectedly sudden.
Extremely steep
Exceedingly sudden and unexpected
Steeply inclined. : steep.

In zoology, abrupt; sharply defined from neighboring parts: as, a sudden antennal club; a sudden truncation.
Hasty; violent; rash; precipitate; passionate.
Hastily made, put in use, employed, prepared, etc.; quick; rapid.
Found or hit upon unexpectedly.
Happening without notice, instantly and unexpectedly; immediate; instant.
Suddenly; unexpectedly.
(idiom) (all of a sudden) Very quickly and unexpectedly; suddenly.

To break off; interrupt; disturb.
Broken or appearing as if broken away or off; marked by or showing a sudden breach or change of continuity; wanting continuation or completion: as, the path or the discourse came to an abrupt termination; an abrupt turn in a road. Hence Steep; precipitous: as, an abrupt cliff; an abrupt descent.
Figuratively, sudden; without notice to prepare the mind for the event; unceremonious: as, an abrupt entrance or address.
Lacking in continuity; having sudden transitions from one subject to another: as, an abrupt style.
In botany, terminating suddenly: as, an abrupt point: sometimes used in the sense of truncate: as, an abrupt leaf.
Dangerously steep

Unplanned, Unanticipated, Surprising, Shock, Drastic, Rapid, Untimely, Precipitated, Dramatic, Precipitous, Explosive, Unforeseen, Sharp, Unexpected, Abrupt

Rapid, Surprise, Brusque, Surprising, Untimely, Drastic, Dramatic, Unexpected, Disconnected, Discourteous, Staccato, Steep, Sharp, Precipitous, Sudden

Unplanned, Unanticipated, Surprising, Shock, Drastic, Rapid, Untimely, Precipitated, Dramatic, Precipitous, Explosive, Unforeseen, Sharp, Unexpected, Abrupt

Rapid, Surprise, Brusque, Surprising, Untimely, Drastic, Dramatic, Unexpected, Disconnected, Discourteous, Staccato, Steep, Sharp, Precipitous, Sudden

Sudden hearing loss with vertigo portends greater stroke risk than sudden hearing loss or vertigo alone.
Study aim To identify cases of sudden death in patients prescribed stimulant medications and Amoxetine to determine association between these and sudden death.
EDIT: It does give the impression of a sudden act of sudden reduction or going beneath though, rather than a steady ongoing process.
Sudden worsening of weakness may be triggered by infections, severe stress, surgery, or a reduction or sudden increase of prednisone.
The sudden appearance of the girl jolts her to a sudden stop.
The sudden discontinuation of the diamond trade was sudden economic downturn for many villagers.
If Sudden Death occurs in a Sudden Death game, this process is repeated.
This athlete is typically experiencing major lactic imminent hyperkalemia from sudden rhabdomyolysis that can complications or even sudden death.
How many words can you make out of sudden Another way to say Sudden Thought?
Flooded my chain nigga Then I Huncho the Range nigga All of a sudden, sudden, sudden All of a sudden.

Avoid abrupt control movements when blades are turning.
Readers may also think the writing is abrupt.
Future abrupt reductions in thesummer Arctic sea ice.
And maybe an abrupt end to the game.
Abrupt cessation can cause vomiting, tremors, and convulsions.
Avoiding abrupt changes in rest cycles for employees.
The ending is abrupt with a weird flow.
The northwestern slope is more abrupt in its northern than in its southern portion, and is generally more abrupt than the southeastern slope.
She was abrupt with the gatekeeper, so the gatekeeper was abrupt in return.
Spontaneous accels are an abrupt transient increase in the FHR with an abrupt return to the baseline.

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