9 letters · 12 points in Scrabble
adjective indicating a lack of maturity
adjective of or relating to infants or infancy
adjective being or befitting or characteristic of an infant
originMid-15th century, "pertaining to infants," from Latin infantilis (“pertaining to an infant”), equivalent to infant + -ile, from īnfāns. Sense of "infant-like" is from 1772.
Etymology from Wiktionary, CC BY-SA 3.0