Meaning of the word "under any circumstances" in English

What does "under any circumstances" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

under any circumstances

US /ˈʌndər ˈɛni ˈsɜrkəmstænsɪz/
UK /ˈʌndə ˈɛni ˈsɜːkəmstənsɪz/

Phrase

no matter what happens or what the conditions are; absolutely not

Example:
You must not open this package under any circumstances.
I will not give up under any circumstances.