毫不
háobù · HSK 7
not at all
毫 = a fine hair (tiniest bit) + 不 = not; so not even a hair's worth = not at all
毫 originally names a fine animal hair, the smallest measurable amount. Pairing it with 不 (not) gives háobù: not by even the tiniest fraction, hence nohow or not in the least.
不 — single pictograph; bird flying upward
Originally a pictograph in oracle bone script, traditionally interpreted as a bird flying up toward the sky and unable to come down, suggesting negation or refusal. Over time it became the standard negation word in Chinese, used before verbs and adjectives to mean 'not'.