いいこと (translations)→ balm break good now remember up
こそこそ (translations)→ sneaking sneaky sneaky-poo
こつ (translations)→ recipe technique
しかける (translations)→ begin build dispose feed offer start
ひそかな (translations)→ clandestine personal private quiet self-contained
ひそむ (translations)→ hide lie lurk stand
ふしぎな (translations)→ new odd oddly strange uncanny
コツ (translations)→ key knack pointer ritual rope something thing touch way
タネ (translations)→ object pretext story
隠す (translations)→ conceal cover disguise elide ensconce fix keep mask plunge pretend put restrain shadow stash stuff tuck
機密 (translations)→ classified security sensitive TS
人知れず (translations)→ secretly undiscovered
内心 (translations)→ actually conscience enjoy enormously inside internal inward inwardly privately truth within
内心の (translations)→ inmost inner
秘密 (translations)→ agent arcanum furtive ignorant knowledge secrecy silent skeleton sneak tight-vested why
秘密の (translations)→ arcane closed-door conspiratorial covert crypto restricted
裏の (translations)→ behind slimy unofficial