infantilistic, a.
(ɪnˌfæntɪˈlɪstɪk)
[f. infantile a. + -istic.]
Pertaining to, exhibiting or characterized by infantilism; abnormally immature.
| 1930 C. G. Seligman Races Afr. ii. 51 Rather should they be considered to represent an early human type ‘infantilistic’ both physically and mentally. 1936 Discovery June 167/2 Negritos, a pygmy, infantilistic, dark-skinned type. |