childish

形容词 childish:

1. indicating a lack of maturity
   同义词：infantile

1. They derided his efforts as childish.
   他们嘲笑他的做法很幼稚。
2. A stupid, disgraceful, or childish act or performance.
   傻事，儿戏，轻率之举愚蠢的，丢脸的或孩子气的行为或表现
3. The little girl spoke in a high childish voice.
   小女孩说话时声音尖尖的，带着童音。

child.ish

adj.（形容词）
Of, relating to, or suitable for a child or childhood:
童年的：儿童或童年的，与儿童或童年有关的或适合于儿童或童年的：
例句：
a high, childish voice; childish nightmares.
响亮的童声；儿童做的恶梦

Marked by or indicating a lack of maturity; puerile:
未成熟的：以未成熟为特征或显得未成熟的；幼稚愚蠢的：
例句：
tired of your childish pranks.
厌倦了你幼稚的胡闹

Not complicated; simple.
不复杂的；简单的
Affected mentally by old age; senile.
年老糊涂的：智力上因年老而受影响的；年老糊涂的

【引伸】
child.ishly
adv.（副词）
child.ishness
n.（名词）