十分
じゅうぶん · juubun · JLPT N4 · na-adj
enough
🔟 十分 = ten + parts: all ten parts out of ten, so fully enough
十 (juu) is ten and 分 (bun) is a part or share. Having ten parts out of ten means nothing is missing, which gives the sense of enough or plenty. Sound hook: juubun is like saying you have ten buns, and ten buns is enough.
十 — single horizontal 一 + vertical 丨
十 originated as a simple vertical line in oracle bone script, representing the number ten, possibly from a knotted cord used for counting. Over time a horizontal stroke was added, giving the modern cross shape. It has consistently meant 'ten' or 'complete' throughout Chinese history.
分 — knife 刀 + eight 八 (split apart)
分 originally depicted a knife (刀) cutting something into two parts, shown by 八 above (which itself meant 'divide'). The core sense is 'to divide' or 'split', from which extended meanings like 'portion', 'minute', and 'part' developed. Pronounced fèn, it carries the sense of an allotted share.