并非
bìng fēi · HSK 7
really isn't
并 (indeed) + 非 (not) — a double-down denial
并 intensifies the negation 非, making it a formal emphatic rejection. Stronger than simple 不是, used when correcting a wrong assumption outright.
并 — two 立 (standing person) side by side
Originally a pictograph of two people standing side by side, depicting togetherness or combination. The modern form 并 merges several historical characters (並, 併, 竝) that all conveyed 'side by side' or 'combine'. Today it means 'and, moreover' or 'to merge', and also negates expectations as in 并不.
非 — two opposing wings 羽-like form
Originally a pictograph showing two wings spread in opposite directions, symbolizing things facing away from each other. From this 'opposition' image came the meaning 'not' or 'wrong.' It is also used as a phonetic component in many characters like 排, 悲, and 罪.