1. Resembling or containing clay
   - argillaceous 
2. (used of soil) compact and fine-grained
   "the clayey soil was heavy and easily saturated"
   - cloggy, heavy

See also: compact

• instauration
• instead
• instep
• instigant
• instigate
• instigation
• instigative
• instigator
• instil
• instill
• instillation
• instillator
• instilling
• instillment
• instilment
• instinct
• instinctive
• instinctive reflex
• instinctively
• instinctual
• instinctually
• institute
• instituter
• institution
• institutional