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

• sentimentality
• sentimentalization
• sentimentalize
• sentimentally
• sentimentise
• sentimentize
• sentinel
• sentry
• sentry box
• sentry duty
• sentry go
• Seoul
• Sep
• Sep 11
• sepal
• sepaline
• sepaloid
• separability
• separable
• separably
• separate
• separate off
• separate out
• separated
• separately