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infantile

in·fan·tile

infantile

pronunciation:
In fn taIl
part of speech: adjective
definition 1: like or suitable to an infant, esp. in behavior; babyish or childish.
synonyms:
babyish
antonyms:
adult
similar words:
childish, green, immature, jejune, juvenile, puerile
definition 2: of or pertaining to infants, infancy, or the earliest stage of development.
similar words:
formative, inchoate, incipient, nascent, natal, newborn, puerile
derivation: infantility (n.)