Unthinkingly is the adverb: doing something without stopping to think about it first, or about what it might do to other people. He unthinkingly repeated the rumour. She unthinkingly reached for her phone.

Unthinkingly unthinkingly is the adverb是副詞：doing something做某件事的時候 without stopping to think about it first沒有先停下來想一想，or about what it might do to other people或想想這可能會對別人造成什麼影響。He他 unthinkingly想都沒想就 repeated the rumour把謠言重複講了出去。She她 unthinkingly想都沒想就 reached for her phone伸手去拿手機。

Two shades live in this one word. One is careless — you said or did something that hurt someone, but not on purpose. The other is automatic — you did it out of pure habit, the way you unthinkingly put your keys in the same pocket every day. The second shade has no blame in it at all; it is just describing how habits work.

this one word這一個字裡 live in藏著 Two shades兩層意思。One第一種 is careless是不小心——you said or did something你說了或做了什麼 that hurt someone傷到了別人的事，but not on purpose但不是故意的。The other第二種 is automatic是出於習慣——you did it out of pure habit你純粹是出於習慣做的，the way you unthinkingly put your keys in the same pocket every day就像你每天不假思索把鑰匙放進同一個口袋一樣。The second shade第二層意思 has no blame in it at all完全沒有責怪的意思；it is just describing它只是在說明 how habits work習慣是怎麼運作的。

Which one a reader hears depends completely on whether the action hurt anybody. It usually sits right before the verb, or at the very start of the clause.

Which one a reader hears讀者聽出來的是哪一種，depends completely on完全要看 whether the action hurt anybody這個行為有沒有傷到人。It usually sits它通常放在 right before the verb動詞前面，or at the very start of the clause或子句的最前面。

It is a fairly formal word — long, with three syllables of suffix — so it shows up in novels, essays, and careful speech, while everyday conversation prefers 'without thinking' or 'by accident'. 'Without thinking' is in fact the safest natural choice for beginners, and means nearly the same thing.

It is a fairly formal word它算是個相當正式的字——long, with three syllables of suffix字尾就有三個音節、很長——so it shows up in novels, essays, and careful speech所以會出現在小說、散文和講究的口語裡，while everyday conversation prefers 'without thinking' or 'by accident'而日常對話比較常用『without thinking』或『by accident』。'Without thinking''Without thinking' is in fact the safest natural choice for beginners其實是初學者最安全、最自然的選擇，and means nearly the same thing意思也幾乎一樣。