필시 + -ㄹ 것이다 / -ㄴ 게 틀림없다
surely, certainly, no doubt (inference)
Example
연락이 없는 걸 보니 필시 무슨 일이 생긴 거예요.
Since there's no word from him, something must have happened.
Word parts
필 surely+시 is
Literally 'surely is'.
Good to know
Signals a strong guess, usually with -ㄹ 것이다 or -ㄴ 게 틀림없다.
Related words