Unworryingly is a antonym of worryingly.
As adverbs the difference between worryingly and unworryingly
is that worryingly is in a worrying manner while unworryingly is in a way that does not involve worry or anxiety.
unworryingly
English
Adverb
(-)
(rare) In a way that does not involve worry or anxiety.
Antonyms
* (all meanings) worryingly