1. Vigilant
   - on guard, upon one's guard, on your guard

See also: wary

• bank holiday
• bank identification number
• bank line
• bank loan
• bank manager
• bank martin
• Bank of England
• Bank of Japan
• bank rate
• bank robber
• bank run
• bank shot
• bank statement
• bank swallow
• bank vault
• bank withdrawal
• bank-depositor relation
• bankable
• bankbook
• banker
• banker's acceptance
• banker's bill
• banker's check
• banker's cheque
• banker's draft