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

See also: invulnerable

• Hypericum perforatum
• Hypericum prolificum
• Hypericum pyramidatum
• Hypericum spathulatum
• Hypericum tetrapterum
• Hypericum virginianum
• hyperidrosis
• hyperinflation
• Hyperion
• hyperkalemia
• hyperkeratosis
• hyperkeratotic
• hyperkinesis
• hyperkinetic
• hyperkinetic syndrome
• hyperlink
• hyperlipaemia
• hyperlipemia
• hyperlipidaemia
• hyperlipidemia
• hyperlipoidaemia
• hyperlipoidemia
• hyperlipoproteinemia
• hypermarket
• Hypermastigina