1. 轻率的：harebell 山小菜 | harebrained 轻率的 | harehearted 胆小的

2. harebrained

2. 轻率的/欠考虑的/粗心的：harebell /山小菜/蓝铃花/ | harebrained /轻率的/欠考虑的/粗心的/ | harehearted /胆小/

3. harebrained

3. 不切实际的,愚蠢的：hardball 棒球 | harebrained 不切实际的,愚蠢的 | harmonica 口琴

4. danci.911cha.com

4. 愚蠢的：26. 睿智的 Sagacious - discerning, sapient, politic, judicious, witty | 愚蠢的 Fatuous - daft, witless, puerile, harebrained | 荒谬的 Preposterous - absurd, insane

1. very foolish

    e.g. harebrained ideas
           took insane risks behind the wheel
           a completely mad scheme to build a bridge between two mountains

    Synonym: insanemad