うすい
weak, pale
Spread far enough that the light comes through, and the soup has had the same treatment. Ooh う, see すい through it: you can taste the water in it: うすい.
弱い よわい is weak as in not strong. 薄い is weak as in thin, watery or pale. Near 上手い うまい in sound only.
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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.