undivulged
1. Undisclosed covered-up unrevealed covert unexposed undivulged secret undercover top-secret hush-hush
未显示的,遮掩的,秘密的
2. secret or hitherto undivulged particulars of history or biography
秘闻历史或传记中秘密的或迄今为止未被披露过的细节