[PoideAdelereX]

So the world is still dukkha even for those in Nibbana.

the following is very important to comprehend because most Buddhists do not comprehend it:

(1) the word 'dukkha' in the Four Noble Truths means 'mental suffering'; 'mental torment'

(2) the word 'dukkha' in the Three Characteristics means 'unsatisfactoriness' (as in impermanent, unsatisfactory & not-self)

for the purpose of emphasis, it can be said both meanings are opposite to eachother

those in Nibbana do not have any dukkka#1 within but constantly experience dukkha#2 (which is the cause of their liberation)

those in Nibbana, due to seeing the world as unsatisfactory (dukkha#2), have no craving for the world, therefore their minds have no suffering (dukkha#1)

the following quote should make the two different meanings of dukkha very clear:

277. "All conditioned things are impermanent" — when one sees this with wisdom, one turns away from suffering. This is the path to purification.

278. "All conditioned things are unsatisfactory" — when one sees this with wisdom, one turns away from suffering. This is the path to purification.

279. "All things are not-self" — when one sees this with wisdom, one turns away from suffering. This is the path to purification.

Dhammapada ***