If you do something without a second thought, you do it without thinking about it carefully, usually because you do not have enough time or you do not care very much.
This murderous lunatic could kill them both without a second thought.
Roberto didn't give a second thought to borrowing $2,000 from him.
2. plural noun
If you have second thoughtsabout a decision that you have made, you begin to doubt whether it was the best thing to do.
I had never had second thoughts about my decision to leave the company. [+ about]
3.
See on second thoughts/on second thought
second thought in British English
noun
(usually plural)
a revised opinion or idea on a matter already considered
second thought in American English
a change in thought about a matter after reconsidering it
Idioms:
on second thought
Examples of 'second thought' in a sentence
second thought
My advice to anyone having second thoughts about attending the marathon is to go and have fun.
The Sun (2013)
Second thoughts, best leave the stickers out of it.
Times, Sunday Times (2012)
It would be no wonder if the club were having second thoughts about allowing the 34-year-old to leave at the end of the season.
The Sun (2013)
Well I bet they are having second thoughts about that now.
The Sun (2012)
I had second thoughts about thin shirts, and about stars and auspicious days and wise men from the east.
Hyland, Paul Indian Balm - Travels in the Southern Subcontinent (1994)
In other languages
second thought
British English: second thought NOUN
If you do something without a second thought, you do it without thinking about it carefully, usually because you do not have enough time or you do not care very much.
If he could, he'd go without a second thought.
American English: second thought
Brazilian Portuguese: sem pensar duas vezes
Chinese: 再次考虑
European Spanish: segunda reflexión
French: moment d'hésitation
German: nochmalige Überlegung
Italian: riflessione
Japanese: 考え直し
Korean: 충분한 생각
European Portuguese: sem pensar duas vezes
Latin American Spanish: segunda reflexión
Chinese translation of 'second thought'
second thought
n
to have second thoughts about sth/about doing sth重新考虑(慮)某事/做某事 (chóngxīn kǎolǜ/zuò mǒushì)
without a second thought不假思索地 (bù jiā sīsuǒ de)
on second thoughts or (US) thought经(經)重新考虑(慮)后(後) (jìng chóngxīn kǎolǜ hòu)