无忧的英文：
without cause for grief
carefree

参考例句：

Looking behind, there is no anxiety
后顾无忧

No internal anxiety
内顾无忧

Merry is that has nought to lose.
无物可丢，坦坦无忧。

When the four weasels felt that they were free from harm they walked toward the chicken coop
这四只黄鼠狼觉得后顾无忧，就朝着鸡圈走去。

without是什么意思：
prep. 没有；不，无；在…范围以外
adv. 在户外；没有或不显示某事物
n. 外部；外面

with or without milk,with or without sugar.
有人愿意在茶中加奶，有人却不愿意有人爱加糖，有人却不爱加糖。

without [with no]stint
无限制地,不吝惜地

"Without money, without tear"
没有钱,就没有忧虑

cause是什么意思：
n. 原因；理由；事业，目标
v. 引起；使遭受；促使

There is no cause for concern.
不必担心。

To cause to zoom.
使急遽上升，使猛增

To cause to taper.
使成锥形

grief是什么意思：
n. 悲伤；不幸
int. 哎呀，天哪

To give is honour, to ask is grief.
捐赠是荣誉；索取是悲哀。

The only cure for grief is action
行动是对悲痛唯一的治疗

His eyes shadowed with grief.
他的眼睛因悲痛而黯然。