vainly
adverb /ˈveɪnli/
  /ˈveɪnli/
 - without success徒劳地;不成功地;白费力地 - He shouted after them, vainly trying to attract their attention.他在他们的后面高喊,想引起他们的注意,却是徒劳。 
 Collocations DictionaryVainly is used with these verbs:- search
- seek
- try
- …
 
- He shouted after them, vainly trying to attract their attention.