unexpected
US /ˌʌn.ɪkˈspek.tɪd/
UK /ˌʌn.ɪkˈspek.tɪd/

1.
inattendu, surprenant
not expected or foreseen; surprising
:
•
The news of her resignation was completely unexpected.
La nouvelle de sa démission était totalement inattendue.
•
We had an unexpected visitor this morning.
Nous avons eu un visiteur inattendu ce matin.