The old book uses this character to describe a dull, unknowing state.
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芚 is a rare literary character. Its plant sense is a fresh green sprout; in classical philosophy it also describes a dull, untutored state of mind, as in 庄子.
屯 supplies the sound tún, matching its own reading. It originally pictured a sprout struggling out of the ground, so it also reinforces the meaning here.
No stroke data for 芚; the glyph shown is your device font, so component strokes can't be highlighted.