This is the 7303rd most frequent German word.
geheimen
"Geheimen" means "secret" or "confidential" in English.
The word 'geheimen' is an attributive adjective in this sentence, modifying 'Wünsche' (wishes), indicating that the wishes are private or not disclosed.
Er vertraute mir seine geheimen Wünsche an.
He confided his secret wishes to me.
Here, 'geheimen' again acts as an attributive adjective describing the noun 'Dokumente' (documents), suggesting confidentiality or restricted access to these documents.
Die geheimen Dokumente wurden in einem Safe aufbewahrt.
The secret documents were kept in a safe.
In this sentence, 'geheimen' is still an attributive adjective, describing the noun 'Mission' (mission), implying a covert or classified nature of the mission.