sǐ​sǐ

firmly

死死 sǐ​sǐ
firmly adverb
in a tight, fixed, or unyielding manner, typically referring to a physical grip or a gaze

He gripped the photograph tightly and refused to let go.

tenaciously adverb
in an unwavering, unbendable, or rigid manner, often regarding persistence or adherence to a position

The soldiers held their ground firmly and repelled several enemy attacks.

Frequency

Movie subtitles
0.720 per million appears in 0% of films
Written text
3.39 per million

Sources

Definitions
CC-CEDICT