Short
い adjective
This is a single kanji with an い on the end, meaning you know it's probably an adjective. What's the adjective form of short? It's short.
This word is used to describe things that are short in length, not in height.
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:
Who has short hair and always wears shorts? It's Ms. Carr (みじか)! Everyone always recognizes Ms. Carr because she's the one with the short hair and shorts, no matter the weather. Ms. Carr, the ultimate short style icon!
そのスカート、ちょっと短すぎるんじゃない？
Isn't that skirt a bit too short?
赤ちゃんが短い手足をバタバタさせてるのは本当にかわいい。
The baby's short, flailing arms and legs are so cute!
わぁ！あんたの尻尾が私より短いなんて、知らなかったわ。
Wah! I didn’t know your tail was shorter than mine.