根本的英文：
simply
fundamental
basic
root

参考例句：

Fundamental ideals
根本的观念

Be awfully neglected
根本被忽视

Islam does not condone terrorism
回教根本不容许恐怖主义。

disparate ideas
根本不相同的看法

I don't give a damn.
我根本不在乎。

He would just as soon offend other people as look at them
他根本就不把得罪人当回事

That hotel doesn't rate five stars at all.
那家旅馆根本够不上五星级。

It's highly improbable that Nora will agree.
诺拉根本不会同意。

But in essence the struggle against bourgeois liberalization is a long-term task.
但从根本上说，这是一个长期的事。

I haven't the faintest idea how to repair the color TV.
我根本不懂怎样修彩色电视机。

simply是什么意思：
adv. 简单地；仅仅，只，不过；简朴地

Their opinions on art are simply for the Birds.
他们对艺术的见解真是荒唐可笑

It can't be simply ornamental．
它不能仅仅是装饰性的。

It was quite simply made.
这东西做得挺简单。

fundamental是什么意思：
adj. 基础的，根本的；十分重要的；原始的，主要的
n. 基本规则，基本原则，基本原理；纲要

fundamental interval
基本差距

fundamental stance
基本站立姿势

This is the fundamental source of the problem with this unit.
这就是这款装置的问题根源。

basic是什么意思：
adj. 基础的；首要的；最简单的；必需的；碱性的
n. 基本原则，基本原理，基本规律

The basic form of this crystal is a rhomb.
此类晶体的基本形状为一菱面体。

This is a basic quartz analog clock.
这是一个普通指针式石英钟。

There is distinction of the basic essentials and the periphery
事有本末