困 means “be troubled, in a fix”

こまる · komaru

Also: quandary, become distressed, annoyed

Kun'yomi (Japanese reading)
こまる
On'yomi (Chinese reading)
コン

JLPT N3 · Taught in grade 6 · 7 strokes

The story

A tree (木) boxed in on every side (囗): no room to grow and nowhere to go. 困る means to be stuck or troubled, and 困ったな, "well, this is a problem", is what you mutter when the last train has already left.

Used in 困る (komaru, to be in trouble), 困難 (konnan, difficulty), and 貧困 (hinkon, poverty)

More from How Things Feel

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