custodial (adj.)

• covering
• defensive
• eagle-eyed
• guarded
• hawk-eyed
• keen-eyed
• lidless
• observant
• open-eyed
• parental
• preventive
• prophylactic
• protecting
• protective
• prudent
• sharp-eyed
• sleepless
• tutelary
• vigilant
• wary
• watchful