1. 幼稚的;孩子气的：Innig [德]内在的;深切的 | Infantile 幼稚的;孩子气的 | Irato 发怒地

2. 婴儿的,幼儿的：infant feeding tube 婴儿鼻饲管 | infantile 婴儿的,幼儿的 | infant incubator 婴儿保温箱

3. 幼年的：infancy 幼年 | infantile 幼年的 | inferred reserves 推算储量

4. 幼稚的：infanticulture 育儿法 | infantile 幼稚的 | infantile amentia 幼儿痴呆

1. 婴儿(期)的;幼儿(期)的
Infantile behaviour or illnesses are typical of very young children.

e.g. ...infantile aggression.
婴儿期的攻击行为
e.g. ...children with infantile eczema.
患婴儿湿疹的儿童

2. 幼稚的;孩子气的
If you accuse someone or something of being infantile, you think that they are foolish and childish.

e.g. This kind of humour is infantile and boring.
这种幽默既幼稚又无聊。

adj

1. indicating a lack of maturity

e.g. childish tantrums
infantile behavior

Synonym: childish

2. being or befitting or characteristic of an infant

e.g. infantile games

3. of or relating to infants or infancy

e.g. infantile paralysis