Deep
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 deep? It's also deep.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. Because the reading sounds just like a dirty word, and there may be innocent children about, I'll let you come up with your own mnemonic for this one. Maybe someone pushes you into a deep hole that will surely kill you so you yell something out as you fall down it?
サングラスが深い池に落ちてしまった。
The sunglasses have fallen into a deep pond.
そんなに深いため息ついて、どうしたの？
I heard you letting out a deep sigh, what happened?
魚たちが、親や兄弟、高校時代の友人たちとの深い繋がりを保っていることが多いって、本当ですか？
Is it true that fish tend to maintain a deep connection with their parents, siblings, and high school friends?