Fundamental
Basic, Standard
な adjective
The things that are basics (基本) like (的) are basic and fundamental.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. Knowing how to read the word 基本 will be helpful too.
私は基本的にはスピリチュアルな事は信じません。
I generally don't believe in spiritual matters.
上司に、基本的な事も知らない役立たずだと言われました。
I was told by my boss that I don't even know the fundamentals and that I'm useless.
基本的に政治に関心がないんです。
Basically, I have no interest in politics.