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.
Let's quickly finish our errands and go home.
If you don't get ready quickly, you'll miss the train.
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.
He coldly went home, leaving his struggling coworker behind.
She hung up without even listening to my request.
I quickly finished my work and went home.
He just went off and left me behind without a second thought.
The children quickly put away their toys.
Get ready quickly, hurry up!
さっさと describes moving briskly and without delay, the opposite of the slow, weary pace suggested by とぼとぼ.