Mid-15th century, "pertaining to infants," fromLatininfantilis(“pertaining to an infant”), equivalent toinfant +-ile, fromīnfāns. Sense of "infant-like" is from 1772.[1]
Eustace gaped at him in amazement. When his urbanity dropped away from him, as now, he had an innocence of expression which was almostinfantile. It was as if the world had never touched him at all.
