Definition of "worryingly"

[…] I have always found it hard that Hamlet, a character that I love and admire, is guilty of a puerile misogyny and, perhaps, more worryingly, of the unnecessary deaths of his old friends from university, Rosencrantz and Guildenstern.

2014 April 12, Simon Russell Beale, “Why Shakespeare always says something new: As the 450th anniversary of Shakespeare's birth approaches, the great Shakespearean actor Simon Russell Beale explains his secrets [print version: The king and I]”, in The Daily Telegraph (Review)‎, London, page R7