How to say "unseen" in Japanese

• 人知れずひとしれずCommon
  expression, adverbCovers 'unseen' as 'unobserved': doing something away from other people's eyes, secretly and without being noticed. The common choice for this sense; picture acts carried out where no one is watching.
• 未見みけん
  no-adjectiveMeans 'not yet seen': something the viewer has not yet laid eyes on, hence also unknown to them. A less common word; it does not describe things hidden from view.
• 人知れぬひとしれぬ
  pre-noun adjectivalThe describing counterpart of 人知れず: secret, hidden, inward — things kept out of other people's sight or knowledge, often feelings held inside. Less common than 人知れず.
• いもしない
  expression, i-adjectiveReally means 'isn't there at all', so 'unseen' only as 'nowhere to be seen'. Seldom the word you want for hidden or unnoticed things. Usually written in kana.

For 'unseen' as hidden from people's eyes, use 「人知れず」 for unobserved actions and 「人知れぬ」 for hidden things; 未見 means not yet seen; 「いもしない」 really asserts absence, 'nowhere to be seen'.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 人知れずひとしれずsecretly
• 未見みけんnot yet seen
• 人知れぬひとしれぬsecret
• いもしないinvisible