babish
/ˈbeɪbɪʃ/(also babbish) Now archaic and literary
adjective
1Characteristic of or befitting a baby; having features associated with a baby; baby-like.
2Specifically depreciative. Unduly childish; babyish, infantile; immature.
Origin
Mid 16th century; earliest use found in Thomas More (1478–1535), lord chancellor, humanist, and martyr. From babe + -ish.