苦 means “bitter”

にがい · nigai

Also: suffering, trial, worry, hardship

Kun'yomi (Japanese reading)
くるしい, くるしむ, くるしめる, にがい, にがる
On'yomi (Chinese reading)
ク

JLPT N4 · Taught in grade 3 · 8 strokes

The story

Green tea and bitter gourd teach that not all flavors are pleasant, yet all have purpose.

Also means "hardship," expressing life's complexities

Its parts

An old (古) plant (艹): bitter tasting

Kanji that look like 苦

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