This is the 2320th most frequent Japanese word.
すっかり
Completely; entirely.
The word 'すっかり' emphasizes the thoroughness of the forgetting process, showing that it was total and without exception.
すっかり忘れていました。
I completely forgot.
Here, 'すっかり' is used to describe the full extent of the improvement in the weather conditions.
すっかり天気が良くなりました。
The weather has become completely better.
In this sentence, 'すっかり' highlights the total transformation of the town, signaling that no aspects remained the same.