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Adjective: hole-and-corner  'hów-lun'kor-nu(r)
  1. Conducted with or marked by hidden aims or methods
    "hole-and-corner intrigue";
    - clandestine, cloak-and-dagger, hugger-mugger, hush-hush, secret, surreptitious, undercover, underground
     
  2. Relating to the peripheral and unimportant aspects of life
    "a hole-and-corner life in some obscure community";
    - hole-in-corner

See also: covert, insignificant, unimportant