Answer: infantile

AnswerCrossword Clue
INFANTILEImmature
INFANTILEChildish.
INFANTILEChildish
infantile(of topographical features) having undergone erosion to a slight extent only
infantileof or pertaining to infants or infancy
infantilelike an infant, childish also INFANTINE
infantilecharacteristic of or befitting an infant; babyish; childish