Meaning of the word unperceived in English

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

unperceived

US /ˌʌn.pɚˈsiːvd/
UK /ˌʌn.pəˈsiːvd/

Adjective

not seen or noticed; not perceived

Example:
The subtle changes went unperceived by most.
His efforts often went unperceived, yet he continued to work diligently.