Definitions:

1. In a way that is pointless, ineffective, or incapable of producing any results. ADVERB
   • She futilely tried to change his mind.
2. Suggests an action or behavior that is done without achieving any desired outcome. ADVERB
   • He argued futilely against the decision.

Synonyms:

• fruitlessly
• hopelessly
• ineffectively
• unsuccessfully
• vainly