Learn French: Il ne travaille ni avec rigueur ni avec délicatesse. - He works neither with rigor nor with delicacy.

When using a preposition of manner like avec (with) or sans (without) followed by an abstract noun to describe how something is done, French drops the article. Because these are abstract qualities describing his work style, you use avec rigueur rather than avec la rigueur.

Why is there no pas after travaille?

The structure ne ... ni ... ni means 'neither ... nor'. Just like with ne ... jamais (never) or ne ... rien (nothing), the ni replaces pas. Adding pas to this sentence would be grammatically incorrect.

Do I have to repeat the preposition avec before both nouns?

Yes. In French, prepositions like avec, à, and de must be repeated before every noun in a list. This rule still applies when using the ni ... ni structure, so you cannot take a shortcut and say ni avec rigueur ni délicatesse.

How does the meaning of délicatesse compare to the English word 'delicacy' here?

While they are related, in the context of performing a task, avec délicatesse means working gently, with a light touch, or with careful tact. It does not refer to a 'delicacy' in the sense of a rare or expensive food.