yán​yán​shí​shí

completely

严严实实 (嚴嚴實實) yán​yán​shí​shí
completely descriptive
thoroughly wrapped or covered so that nothing is exposed or visible
tightly descriptive
firmly sealed or closed so as to leave no openings or gaps

Frequency

Movie subtitles
0.780 per million appears in 0% of films
Written text
1.50 per million

Sources

Definitions
CC-CEDICT