hare-brained
adjective /ˈheə breɪnd/
  /ˈher breɪnd/
 (informal)- crazy and unlikely to succeed疯狂的;轻率的 - a hare-brained scheme/idea/theory轻率的计划/想法/理论 
 Collocations DictionaryHare-brained is used with these nouns:- scheme
 
- a hare-brained scheme/idea/theory