sans réponse, resté sans réponse
Many questions about Venus remain unanswered.
De nombreuses questions concernant Vénus restent sans réponse.
There was still one unanswered request.
Il restait une demande sans réponse.
— Weathering with You (2019)
Certain questions remained unanswered.
Certaines questions sont restées sans réponse.
The question remains, unanswered.
La question demeure sans réponse.
His question remained unanswered.
Sa question est restée sans réponse.