brash

1. (of people or behaviour) Overly bold or self-assertive to the point of being insensitive, tactless or impudent; shameless.Examples: "a brash young businessman; a brash tabloid; a brash sense of humour"; "Mrs. Mayfield looked away, and the girl stricken with remorse, hastened to her and said: “There, I have been too brash, haven’t I? You must forgive me for I didn’t intend to be brash.” “Brash, my dear? What do you mean by that?” She laughed. “Why, I thought everybody know’d what brash meant. Well, it’s er—too quick to say somethin’ you oughtn’t to say.”"; "Trouble with Silzer is, he’s too brash—shoots off his mouth too much—likes to hear himself talk."Synonyms: audacious, brassy, brazen, cocky, undiplomatic

2. (of actions) Overly bold, impetuous or rash.Examples: "[…] just because you’re a little hot under the collar, don’t do anything brash, for fear you may regret it afterward."; "Now, Mr. Reed, you’ve committed nothing but a brash act of bad taste by bypassing the standard channels."Synonyms: foolhardy, reckless

3. (of things) Bold, bright or showy, often in a tasteless way.Examples: "brash colours"; "a brash perfume"; "1963, Ian Fleming, Thrilling Cities, London: Jonathan Cape, Chapter 1, “Hong Kong,” There are scores of brash and noisy bars along Lockhart Street and in Wanchai and North Point (on the island) and throughout the back lanes of Kowloon […]"Synonyms: flashy, garish, loud, splashy, bedizened, blatant, blingish, brash