Without
With No
noun, suffix
This is the noun version of the kanji nothing, so when you have nothing, you are without.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
When you are without you don't have anything to eat either, so you end up gnashing (なし) your teeth together instead.
このブドウはタネ無しだから食べやすいですよ。
These grapes are seedless, so they are easy to eat.
ドタキャンは無しでお願いしますね！
Please, no last-minute cancellations, okay?
オレ、金無し、仕事無し、ブサメンの四十代だぜ。なんでオレなんかと付き合いたいの？
I'm broke, jobless, and am an unattractive guy in my forties. Why would you want to be with someone like me?