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

• tranquillising
• tranquillity
• tranquillize
• tranquillizer
• tranquillizing
• tranquilly
• trans fat
• trans fatty acid
• trans-
• trans-Alaska pipeline
• transact
• transactinide
• transaction
• transaction file
• transactional immunity
• transactions
• transactor
• transalpine
• transaminase
• transaminate
• transamination
• transatlantic
• Transcaucasia
• transceiver
• transcend