1. Indicating a lack of maturity
   "infantile behaviour"
   - childish 
2. Of or relating to infants or infancy
   "infantile paralysis" 
3. Being or befitting or characteristic of an infant
   "infantile games"

See also: immature, infancy, young

• horsecloth
• horsefish
• horseflesh
• horsefly
• horsefly weed
• horsehair
• horsehair lichen
• horsehair wig
• horsehead
• horsehide
• horselaugh
• horseleech
• horseless
• horseless carriage
• horseman
• horsemanship
• horsemeat
• horsemint
• horseplay
• horsepond
• horsepower
• horsepower-hour
• horseradish
• horseradish peroxidase
• horseradish root