ほそい
thin, narrow, slender
Thread drawn out across a field until there is hardly anything of it left to see. Her fingers go the same way, thin as a hose ほそ: ほそい.
薄い うすい is thin as in not thick, a slice or a flavour. 細い is thin as in narrow, a thread or a finger.
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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.