All 9 Uses

nevertheless
in
And Then There Were None
(Edited)

He was very ably defended and made a good impression on the jury in the witness box. Nevertheless, on the evidence, he was certainly guilty.
p. 65.2

nevertheless = despite that (used to connect contrasting ideas)
He was conscious of the judge's acute logical brain. But nevertheless he wavered. Mr. Justice Wargrave might have a good brain but he was an elderly man.
p. 112.7
"Did you find the actual weapon used?"
"No."
"Nevertheless you are sure of your facts?"
"I am quite sure."
p. 148.6
I could have told you that your search would be fruitless. Nevertheless I am strongly of the opinion that 'Mr. Owen' (to give him the name he himself has adopted) is on the island.
p. 149.9
Your indignation is very natural. Nevertheless you must admit that the facts have got to be faced.
p. 156.9
But the sound did not come again. Nevertheless Blore was convinced that he was not mistaken.
p. 234.1
Death was very near to Philip Lombard now. It had never, he knew, been nearer. Nevertheless he was not beaten yet.
p. 264.4 *
"Ten people dead on an island and not a living
soul on it. It doesn't make sense!"
Inspector Maine said stolidly: "Nevertheless, it happened, sir."
p. 271.4
That sort of thing, he explained, was quite impossible to prove, but he was nevertheless quite sure of it in his own mind.
p. 288.6

nevertheless = still (used to connect contrasting ideas)

Definitions:

(1) (nevertheless)
despite that

Based on idea 1 we might not expect idea 2, but this is a way of saying that even though idea 1 was just stated, we still have idea 2. Synonyms include in spite of that, despite that, nevertheless, nonetheless, on the other hand, in contrast and but.
(2) (meaning too rare to warrant focus)