He wept silently, not letting anyone see his tears.
Tips
usage
泣 describes crying that is quiet and internalized — soft sobbing, often suppressed. It contrasts with 哭 (kū), which is open crying or weeping, and 号啕 (háotáo), which is loud wailing. 泣不成声 (choked with sobs, unable to speak) is a common idiom.