unforthcoming

Trials in Mexico are not conducted in public, and authorities have been especially unforthcoming about the San Fernando investigation.

Astronauts, it turns out, are not ideal subjects for medical study, because they are notoriously stoic and unforthcoming about any symptom that might ground them.

He said McGrath had been "unco-operative and unforthcoming with information" during the hearing and branded him a "thoroughly dishonest witness, quite prepared to manipulate and forge evidence and tell lies in court".

Shakespeare’s characters are much richer and more readable than someone as unforthcoming as Trump.

The trailer is unforthcoming, and the film doesn’t come out until some time next year.