まっすぐ
straight ahead, straightforward
True straight, both characters saying it and neither of them bending. A mass まっす of road and not one bend in it. Down this way and keep going: まっすぐ.
素直 すなお is straightforward about a person, honest and unresisting. 真っ直ぐ is a line, and it does an honest person as well.
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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.