严谨的英文：
rigorous
strict
careful
cautious
compact
well-knit

参考例句：

The essay is well-knit
文章结构严谨。

A well - knit body;a well - knit theatrical production.
结实的身体;结构严谨的戏剧

He used words too loosely.
他用字太不严谨。

He is prim and precise in manner.
他的态度一本正经而严谨。

Extremely careful;scrupulous.
非常仔细的;严谨的

The speech was carefully phrased.
该演讲措词严谨。

A very precise man
非常严谨的人

He is a Bluenose.
他是个严谨的人

The scholar is an exact thinker.
这位学者思维严谨。

He's a man of accuracy and strict method.
他是个精细而严谨的人。

rigorous是什么意思：
adj. 严格的，严厉的；严酷的；严峻的；精确的；严密的

The climate here is rigorous.
这里的天气很严酷。

He was treated with great rigor.
他受到极为苛刻的待遇。

These soldiers are seasoned to the rigors of the climate.
这些士兵适应严酷气候。

strict是什么意思：
adj. 严格的；严厉的；严谨的；精确的；完全的；周密的

follow a strict diet
严格遵照饮食规定

She is strict in the matter of discipline.
她对纪律的要求是严格的。

There are strict controls on immigration into this country.
移民到这个国家有严格的限制。

careful是什么意思：
adj. 小心的，仔细的，周密的，谨慎的；节约的

Have you heard the CARE？
你听说过美国援外汇款合作组织吗？

not care a hoot
1.毫不在乎

Be careful of the instruments.
别损坏仪器。