ふかい
deep, profound
A hand reaching down into the water and not touching anything at the bottom of it. Foo ふ, Kai かい went in the once, and nobody swims in that pond twice: ふかい.
Does depth and profundity both. 深い意味 is a deep meaning.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.