“Secret investigation” in Japanese
Short answer
Secret investigation in Japanese is “内偵” (naitei). Full meaning: secret investigation, private enquiry, private inquiry, reconnaissance, scouting.
Other ways to say “Secret investigation” in Japanese
探偵
tantei detective, investigator, sleuth; detective work, secret investigation
内探
naitan private inquiry, private enquiry, secret investigation
たんてい
tantei detective, investigator, sleuth; detective work, secret investigation
タンテー
tantei detective, investigator, sleuth; detective work, secret investigation
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