impairanother word for 'make worse' meaning to damage or spoil the quality ofChronic sleep deprivation can severely impair concentration and decision-making ability.NoteChronic sleep deprivation can severely impair concentration and decision-making ability.Elon.io is an online learning platformWe have an entire course teaching IELTS Vocabulary — Band 7+ grammar and vocabulary.Start learning IELTS Vocabulary — Band 7+ now