Webster's English Dictionary

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brash

1. brash \'brash\ n [obs. E brash to breach a wall] : a mass of fragments 
   (as of ice) 
2. brash aj [origin unknown] 1: BRITTLE {~ wood}  2a: tending to act in 
   headlong fashion : IMPETUOUS  2b: done in haste without regard for 
   consequences : RASH  3: uninhibitedly energetic or demonstrative : 
   BUMPTIOUS  4a: lacking restraint and discernment : TACTLESS  4b: 
   aggressively self-assertive : IMPUDENT  5: piercingly sharp : HARSH  - 
   brash.ly av