unangemeldet

unannounced, without an appointment

un not; opposite of + an toward, onto, or into contact + ge past participle marker + meld report, notify + et past participle
adverb Rare #47,925
unannounced, without an appointment Used when someone arrives or visits without having arranged it in advance.
GE: Er kam unangemeldet zu Besuch.
EN: He came to visit without announcing himself.

Entschuldigen Sie, dass ich unangemeldet komme.

Please excuse my unannounced visit.

— La Grande Bellezza - Die große Schönheit (2013)

Sie kam unangemeldet.

She came unannounced.

Tom kam unangemeldet.

Tom came unannounced.

Verzeihung, dass ich unangemeldet komme, ich habe Ihre Telefonnummer nicht.

I apologize for coming unannounced; I don't have your phone number.

— Das Waisenhaus (2007)