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Jyutping bat1 gaa2 si1 saak3
Pinyin bù jiǎ sī suǒ

Definitions (粵典–words.hk)
  1. 動詞
    唔​需要​思考​、​考慮
    without thinking or consideration
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)

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Jyutping bat1 gaa2 si1 sok3
Pinyin bù jiǎ sī suǒ

Definitions (CC-CEDICT)
  1. (idiom) to act without taking time to think; to react instantly; to fire from the hip
Definitions (粵典–words.hk)
  1. 動詞
    唔​需要​思考​、​考慮
    without thinking or consideration
Definitions (Wiktionary)
  1. phrase, idiomatic
    without hesitating
Definitions (HSK3.0)
  1. HSK3 七一九级词汇表 #276
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    汤姆不假思索脱口而出。
    湯姆不假思索脱口而出。
    tāng mǔ bù jiǎ sī suǒ tuō kǒu ér chū 。
    • Tom speaks without thinking.
Examples (Wiktionary)
  1. Mandarin
    不假思索
    不假思索
    bù jiǎ sī suǒ
    • without hesitation
  2. Mandarin
    我们这些繁体字出身的人会不假思索地说“言”是常体,“讠”是变体。但是简体字出身的同志未必会同意。
    我們這些繁體字出身的人會不假思索地説“言”是常體,“訁”是變體。但是簡體字出身的同志未必會同意。
    wǒ men zhè xiē fán tǐ zì chū shēn de rén huì bù jiǎ sī suǒ dì shuō “ yán ” shì cháng tǐ , “ 讠 ” shì biàn tǐ . dàn shì jiǎn tǐ zì chū shēn de tóng zhì wèi bì huì tóng yì .
    • Those of us who grew up with traditional Chinese characters will not hesitate to say that 言 (yán) is orthodox and that 讠 is a variant. But those comrades who grew up with simplified Chinese characters may not necessarily agree.