tam·per·proof 
(tămpər-prf′)
(tămpər-prf′)adj.
Designed to prevent tampering or provide evidence of tampering: tamperproof aspirin containers.
- underarm
- underbanked
- underbelly
- under belt
- underbid
- under-bid
- underbidder
- underbite
- underbody
- underboss
- under breath
- underbred
- underbrush
- underbuy
- under canvas
- undercapitalization
- undercapitalized
- undercard
- undercarriage
- undercharge
- underclass
- underclassman
- underclothes
- underclothing
- divide and conquer