1. Not to be placated or appeased or moved by entreaty
   - grim, inexorable, relentless, stern, unforgiving, unrelenting

See also: implacable

• hypertonia
• hypertonic
• hypertonicity
• hypertonus
• hypertrophic cardiomyopathy
• hypertrophic rosacea
• hypertrophied
• hypertrophy
• hypervelocity
• hyperventilate
• hyperventilation
• hypervitaminosis
• hypervolaemia
• hypervolemia
• hypesthesia
• hypethral
• hypha
• Hyphantria
• Hyphantria cunea
• hyphema
• hyphen
• hyphenate
• hyphenation
• hyphercharge
• Hyphomycetes