'Infantile' definitions:

Definition of 'infantile'

From: WordNet
adjective
Indicating a lack of maturity; "childish tantrums"; "infantile behavior" [syn: childish, infantile]
adjective
Of or relating to infants or infancy; "infantile paralysis"
adjective
Being or befitting or characteristic of an infant; "infantile games"

Definition of 'Infantile'

From: GCIDE
  • Infantile \In"fan*tile\ (?; 277), a. [L. infantilis: cf. F. infantile. See Infant.] Of or pertaining to infancy, or to an infant; similar to, or characteristic of, an infant; childish; as, infantile behavior. [1913 Webster]