forgetfully       
adverb uk/fəˈɡet.fəl.i/ us/fɚˈɡet.fəl.i/
 健忘地,记性差地
in a way that is forgetful (= often forgetting things)
  I forgetfully left the file on the bus. 我记性差,把文件忘在公共汽车上了。 
 He forgetfully walked out of a store without paying for a pair of headphones. 他没付耳机钱就健忘地走出了商店。 
 See: forgetful
 - More examples
 - She forgetfully left a pair of scissors in her hand luggage and had them confiscated.
 - He's one of those people who forgetfully leave their phone in their back pocket and then sit on it.
 - I could forgetfully leave my car doors unlocked and nothing bad ever happened.