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Noun: trifler  trI-f(u-)lu(r)
  1. One who behaves lightly or not seriously
    "The trifler's jokes were inappropriate for the solemn occasion"

Derived forms: triflers

Type of: bum [N. Amer, informal], deadbeat [informal], do-nothing [informal], idler, layabout [informal], loafer, shirker [informal], slacker [informal]