Correct

宿昔

/ sù xī / 
Strokes

Definition

formerly/in the past

Example

As an Adjective

always; habitual

1
Sùxī
宿昔
zhī
之
hàn
憾

long-time regret

As a Noun

very short time

2
Sùxī
宿昔
zhījiān
之间

in a very short time

3
Sùxī
宿昔
chéngmíng
成名

become famous overnight