(ひみつ)

ひみつ
noun
secret
1. secret, confidential matter
Something that is kept hidden from others.
これ秘密(ひみつ)
This is a secret.
秘密(ひみつ)(まも)
To keep a secret.
秘密(ひみつ)しておいて
Keep it a secret.
I confided a secret to my friend.
We promised to keep it a secret between just the two of us, but everyone found out.

秘密(ひみつ) means a secret or confidential matter. It functions as a noun and can modify other nouns with (秘密(ひみつ)場所(ばしょ), a secret place).

COMMON EXPRESSIONS:

SIMILAR WORDS:

NOTE:
秘密(ひみつ) is neutral in register and works in both casual and formal contexts. ないしょ is softer and more colloquial — ないしょして is the casual equivalent of 秘密(ひみつ)しておいて.