副词

1. 根本上;本质上
You use essentially to emphasize a quality that someone or something has, and to say that it is their most important or basic quality.

2. 大体上;基本上
You use essentially to indicate that what you are saying is mainly true, although some parts of it are wrong or more complicated than has been stated.

1. in essence
at bottom or by one's (or its) very nature

e.g. He is basically dishonest
the argument was essentially a technical one
for all his bluster he is in essence a shy person

Synonym: basicallyfundamentally