self-restraint; voluntary restraint; self-imposed control; self-discipline
grave; solemn; serious; harsh (e.g. truth); hard; strict
strict crackdown on and elimination of misconduct; strict enforcement of discipline
silent; quiet; solemn; softly; quietly; solemnly
solemnly; respectfully; reverently; quietly; softly; silently
refraining from going outside; staying indoors
cleaning up (political party)
humble greeting at the beginning of a letter