bad debt; nonperforming loan
poor physical health; bad shape
inferior goods; defective product; defective goods
indigestion; dyspepsia; incomprehensibility; inability to understand
bad girl; juvenile delinquent
bad behavior; misbehavior
faulty maintenance; poor maintenance; inadequate maintenance
malnutrition; malnourishment
bad inventory; deadstock; dead stock
gang of hoodlums (hooligans); bad company; companion in gang activities
underdevelopment; poor development; maldevelopment; decreased growth; stunting
delinquency; misdeed; misconduct; delinquent behavior
aplastic anemia; aplastic anaemia
blood circulation failure
old sinner; elderly man-about-town; older person who enjoys free and easy lifestyle unfettered by social taboos
nonperforming asset; bad assets; toxic assets
insulator; nonconductor; poor conductor
trouble-shooting; fault analysis
getting mixed up with the wrong people; getting into bad company
defective pixel (on an LCD display)