futile
adj. B2 Upper Intermediate US //ˈfjutəɫ// UK //fjˈuːtaɪl// fu·tile
adj. having no result or effect. You use this to describe an action that is a waste of time because it cannot succeed.
adj. incapable of producing any useful result; pointless. Often used predicatively after linking verbs like 'be', 'seem', or 'feel'.
It is futile to argue with him when he is angry.
The rescue team realized their efforts were futile as the storm grew too dangerous to continue.
Despite the diplomat's tireless mediation, the peace talks proved futile when both factions refused to concede even the most minor territorial points.
From Middle French futile, from Latin fūtilis.
Usage
Often follows a linking verb or precedes a noun; frequently pairs with the 'it is... to' construction.