sōng​xiè

lax

松懈 (鬆懈) sōng​xiè
lax adjective
undisciplined, complacent, or loose in organization or spirit.

Due to lax discipline, the team's efficiency has decreased.

slacken verb
to relax one's efforts, slack off, or let down one's guard.

The match isn't over yet; we must not slack off.

Frequency

Movie subtitles
1.28 per million appears in 1% of films
Written text
3.55 per million

Sources

Definitions
CC-CEDICT