adverb
quickly; promptly; without delay; briskly
A mimetic adverb for doing something quickly and without lingering. In commands such as さっさとしろ, it can sound impatient or brusque.
用事をさっさと済ませて、早く帰ろう。
Let's quickly finish our errands and go home.
If you don't get ready quickly, you'll miss the train.
adverb
indifferently; coldly; without caring
Used when someone moves on or acts quickly in a way that feels uncaring, dismissive, or emotionally cold; the coldness usually comes from the context.
困っている同僚を残して、彼はさっさと帰ってしまった。
He coldly went home, leaving his struggling coworker behind.
彼女は私の頼みを聞かずに、さっさと電話を切った。
She hung up without even listening to my request.