harebrained

1. (of an idea or plan etc) Absurd, foolish or stupid.Examples: "“Now why do I get the feeling we're not talking about the harebrained plan you came up with?” “It wasn't harebrained.” “Did it have you going within twenty feet of a whorehouse at night, unchaperoned?” He knew darn well it did."Synonyms: addlebrained, addlepated, airheaded, bee-brained, beef-witted, beefheaded, beetle-headed, birdbrained

2. (of a person) Frivolous and silly; featherbrained or scatterbrained; stupid.Examples: "Her getting a parcel from a hare-brained wench at the coaches in St. John Street; her booty made at the fire, and again at Harwich, all give us excelle"Synonyms: absent-minded, half-brained, addlebrained, addlepated, airheaded, bee-brained, beef-witted, beefheaded