Briefly vs Curtly - What's the difference?

As adverbs the difference between briefly and curtly

is that briefly is (manner) in a brief manner, summarily while curtly is in a curt manner; tersely, almost rudely.

(en adverb)

(manner) In a brief manner, summarily.

He covered the subject briefly in his book.

(duration) For a brief period.

He only worked here briefly .

(speech act) To be brief, in short.

Briefly , I am not happy about what happened, but no one will be losing their job.