Neglect
Negligence, Carelessness
noun, な adjective
The kanji and the word are exactly the same. That means they share meanings as well.
おろそか
The reading for this word is an exception. Here's a mnemonic to help you remember it:
You notice a lot of neglect when it comes to old road soap cars (おろそか). If you drive down the old road you'll see neglected cars made of soap all over the place. It's sad, really.
基本を疎かにしてはいけません。
You must not neglect the basics.