こっそりした 秘密の 類義語 stealthy clandestine 例文 He took a surreptitious glance at his watch during the meeting. 日本語訳 彼は会議中にこっそり時計を見た。 英語定義（AHD） Obtained done or made by clandestine or stealthy means. 覚え方 サッ（sur）とレプ（rep）で密（itious） 素早く密かに何かをするイメージ serendipitous幸運な
Optimized studying based on the forgetting curve vastly improves memorization. - What is reminDO?
