USELESS

[adjective]Without fuel, the vehicles will become useless (= of no use) for moving supplies.When he's in one of his moods, it's useless trying to discuss anything with him (= discussion will not be successful, so you shouldn't try).It's useless to speculate without more information.She's very good at methodical work, but useless when there's a lot of pressure.(informal) You're absolutely useless (= not able to act effectively) - can't you even go to the shops without getting lost!