adverb, adverb taking the 'to' particle
Describes a total, often sudden change or disappearance, similar to すっかり. Used with verbs like 忘れる, 変わる, 消える.
彼のことはけろりと忘れてしまった。
I completely forgot about him.
My cold has completely gone.
adverb, adverb taking the 'to' particle
nonchalantly; as if nothing happened
Describes acting calm or indifferent after something that would normally cause a reaction, often with している or と. Related to けろっと.
See also: けろっと
Even when scolded, he acts as if nothing happened.
She laughed nonchalantly even after making a mistake.
He had completely forgotten the promise.
She lied with a completely unbothered expression.
Even though he got scolded, he's acting like nothing happened.
After taking the medicine, my headache completely disappeared.