Inflected forms: brash·er, brash·est 1a. Hasty and unthinking; impetuous. b. Rash. 2. Lacking in sensitivity or tact. 3. Presumptuously forward; impudent. See synonyms at shameless. 4. Brittle: brash timbers.
ETYMOLOGY:
Possibly imitative (influenced by rash1) or from brash, attack.