1. Immune to attack; incapable of being tampered with
   - impregnable, inviolable, secure, strong, unassailable

See also: invulnerable

• dental hygienist
• dental implant
• dental medicine
• dental orthopaedics
• dental orthopedics
• dental plaque
• dental plate
• dental practice
• dental practitioner
• dental procedure
• dental school
• dental surgeon
• dental surgery
• dental technician
• dentalium
• Dentaria
• Dentaria bulbifera
• Dentaria diphylla
• dentate
• dentate leaf
• dentate nucleus
• dented
• dentelle
• denticle
• denticulate