HSK 7-9
不假思索
bùjiǎ-sīsuǒ(idiom) to act without taking time to think; to react instantly; to fire from the hip
他不假思索地答应帮助我。
Tā bù jiǎ sī suǒ dì dā ying bāng zhù wǒ.
He agreed to help me without a second thought.
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Appears across levels (7-9) in the HSK 3.0 word list.