INFANTILE Scrabble 12 Words With Friends 15 Definition adjective indicating a lack of maturity. — synonyms: childish adjective of or relating to infants or infancy. adjective being or befitting or characteristic of an infant. Examples “infantile paralysis” See all 165 words you can make from INFANTILE → 9-letter words Words starting with I Words ending with E ← Unscramble different letters