unannounced
🇺🇸
/ˌʌnəˈnaʊnst/
🇬🇧
/ˌʌnəˈnaʊnst/
adjective
R
Not previously mentioned or expected; arriving or occurring without warning.
The teacher made an unannounced visit to our class to check our progress.
translation
Not previously mentioned or expected; arriving or occurring without warning.