薄弱
はくじゃく · hakujaku · JLPT N1 · noun
infirmity
薄 — grass radical 艹 + 溥 (pǔ, phonetic)
薄 is a semantic-phonetic compound. The grass radical 艹 on top hints at the original meaning — thin, sparse vegetation or undergrowth. The lower part 溥 supplies the sound. From 'sparse plants' the meaning broadened to 'thin', 'slight', or 'meager' in general use.
弱 — two 弓 (bows) + two 彡 (feathers/strokes)
Originally depicted two bent bows with drooping feathers or fine hairs, suggesting something pliant and weak. The doubled 弓 emphasizes flexibility, while 彡 evokes delicate, thin strands. The image of a soft, bending bow extended to mean 'weak,' 'frail,' or 'young.'