1. Of the colour of slate or granite
   - slate-grey [Brit, Cdn], slate-gray [US], slaty-gray [US], slaty, slatey, stone-grey [Brit, Cdn], stone-gray [US]

See also: achromatic, neutral

• irremediably
• irremissible
• irremovable
• irreparable
• irreparably
• irreplaceable
• irreplaceableness
• irrepressibility
• irrepressible
• irrepressibly
• irreproachable
• irreproachably
• irreproducibility
• irreproducible
• irresistibility
• irresistible
• irresistible impulse
• irresistibleness
• irresistibly
• irresolute
• irresolutely
• irresoluteness
• irresolution
• irresolvable
• irrespective