The word "defeatist" refers to someone who has a negative attitude and believes that they cannot succeed or overcome challenges. They easily give up and have a pessimistic outlook on life. Full definition
Indigenous peoples continually confront negative stereotypes and defeatist attitudes about our abilities and capacity. (humanrights.gov.au)
«There's a kind of defeatist mentality about the academic record,» says Dan Bauer, CEO of The MBA Exchange. (canadianbusiness.com)
Until Roma, Napoli and whoever else challenges for the Scudetto changes their approach and defeatist mentality, Juve's domestic dominance will continue. (italianfootballdaily.com)