This is the 882nd most frequent Ukrainian word.
безуспішні
Unsuccessful.
The word 'безуспішні' describes the quality of the attempts as being without success.
Їхні спроби відчинити замок були безуспішні.
Their attempts to open the lock were unsuccessful.
Here, 'безуспішні' qualifies the negotiations emphasizing their failure to produce a positive outcome.
Попередні переговори виявилися безуспішні, що викликало занепокоєння.
The previous negotiations turned out unsuccessful, which caused concern.
'Безуспішні' illustrates the lack of success in the efforts mentioned.