42. useless (adj) 1. Not useful; hot doing or achieving what si needed or wanted this pen is useless (to do something) he knew it was useless to protest. (doing something) It’s useless worrying about it. She tried to work, but is was useless 9 she wasn’t able to) 2. (at something/ at doing something) (informal) not very good at something. Not able to do thing well I’m useless at French don’t ask her to help. She’s useless. Uselessly (adv.) uselessness (noun)