Picture something with the volume turned up too high. A person walks in talking loudly and does not notice the room. A wall is painted a yellow you can see from the bus stop. A decision gets made before anyone can say wait. Brash is that feeling of too much, too fast, with no soft edges — and the person using the word usually does not like what they are looking at.
From the word’s history
Wiktionary marks the origin as uncertain, and offers a possible link to Scots brash, meaning a violent onset or an attack, with a further family resemblance to German barsch and Danish barsk, both meaning harsh or rough.
維基詞典說這個字的來源並不確定。它提出一種可能：來自蘇格蘭語的 brash（猛烈的衝撞、攻擊），並且可能跟德語 barsch、丹麥語 barsk（粗硬、不客氣）同一家。因為來源本身就標著「不確定」，所以這只是一條參考線索，不是定論。
Wiktionary (kaikki extract, etymology_text supplied in this packet: kaikki:3f6f69a190036ae4:327527048)
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