駄 means “worthless, trivial, packhorse”

だ · da

Also: burdensome, pack horse, horse load, send by horse

On'yomi (Chinese reading)
ダ, タ

JLPT N1 · Taught in secondary school · 14 strokes

The story

A horse (馬) loaded fat (太): a packhorse, the plodding, cheap end of the stable. From there 駄 means trivial or worthless: 無駄 is waste, 駄目 is no good, 駄菓子 are penny candies, and 下駄 are wooden clogs.

Used in 無駄 (muda, waste), 駄目 (dame, no good), and 下駄 (geta, wooden clogs)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.