unsuccessfully

to make an attempt to do something but fail

to look carefully for someone or something but fail to find them

to fight or struggle with determination against something, but ultimately fail

to try to find or get something, especially something that is not a physical object, but fail

to disagree with a plan or policy and try to stop it, but fail

to question a decision or statement but fail to change it

to make a formal request to a higher authority for a decision to be changed, but fail

to be a candidate in an election but not win (esp. AmE)

to take legal action against someone but lose the case

to be a candidate in an election but not win (esp. BrE)

to try to persuade a politician or official to support or oppose a change in the law, but fail