"Nikdy nebyl nemocný?"

[dsarkarati]

"Wasn't he ever sick?" is a more natural sounding translation.

[ValaCZE]

"Wasn't he ever sick?" - "Nebyl NĚKDY nemocný?"

[Necabby]

I agree, and also think ."Was he ever sick?" works in this case. The double negative is a difficult concept to grasp for english speakers :D

[ValaCZE]

I would translate ."Was he ever sick?" like "Byl někdy nemocný?". The czech sentence is negative so the english translation can't be positive.

[lewicelewice]

Has he ever been ill? - sounds better to me