Thin
Slender
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 thin? It's also thin, though it can be slender as well.
If your garden is too thin, just get out the hose (ほそ)! How about if your hair is thin? Point the hose at your head! Hoses can cure any thin issues you may have.
この糸はちょっと細すぎますね。
I think this thread is a bit too thin.
ピアニストみたいに細くて長い指だね。
Your fingers are slender and long like a pianist's.
私のダイエット計画は、基本的に友達全員にカップケーキを作ることです。つまり、みんなを太らせれば太らせるほど、私が細く見えるってわけ。
My dietary plan is basically to make all of my friends cupcakes. The fatter they get, the skinnier I look.