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Adjective: niggly (nigglier,niggliest)
  1. Causing irritation or annoyance
    - annoying, bothersome, galling, irritating, nettlesome, pesky [informal], pestering, pestiferous, plaguy, plaguey, teasing, vexatious, vexing, irksome, dratted [informal]
  2. [informal] Small and of little importance
    - fiddling [informal], footling [informal], lilliputian [informal], little [informal], niggling [informal], piddling [informal], piffling [informal], petty [informal], picayune [N. Amer, informal], trivial [informal], piddly [informal]

Derived forms: nigglier, niggliest

See also: disagreeable, unimportant