Translation of "surreptitious" into Japanese

秘密の

IPA : /sərəptɪʃəs/

synonyms:

• furtive,
• underground,
• sneaky,
• undercover,
• secret

Spenser would not tell anyone his surreptitious plan to get back at his friends for pranking him.

スペンサーは、いたずらをした友人に仕返しするという密かな計画を誰にも言わなかった。