Meaning of the word "not always" in English

What does "not always" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

not always

US /nɑt ˈɔl.weɪz/
UK /nɒt ˈɔːl.weɪz/

Adverb

not on every occasion; sometimes but not always

Example:
It's not always easy to make the right decision.
He's usually on time, but not always.