bù不notjiǎ假needsī思thinksuǒ索ponder
Without thinking; without hesitation; off the top of one's head.
Literal meaning
not (不) — need (假) — think (思) — ponder (索)
Origin
A classical four-character phrase indicating a quick, unreflective response.
Examples
Tā他bù不jiǎ假sī思suǒ索de地huí回dá答le了zhè这ge个wèn问tí题。
He answered the question without thinking.
Tā她bù不jiǎ假sī思suǒ索de地dā答ying应le了tā他de的qǐng请qiú求。
She agreed to his request without hesitation.
Usage & nuances
Can imply either quick wit or a lack of careful consideration, depending on context.
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