I have read that Kierkegaard besides his mother tongue danish only learned to speak a little german.
But he off course knew how to read and write greek and latin very well.
But how about other languages?
Related language anecdote:
When Kierkegaard lived the rule in Denmark was that dissertations were mandatory to be written in latin, but Kierkegaard applied to the danish King for a dispensation from the rules. His dissertation was therefore written in danish, but he made his verbal defense in latin.