Definition of pernicious adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//pəˈnɪʃəs//
; NAmE NAmE//pərˈnɪʃəs//
jump to other results
having a very harmful effect on somebody/something, especially in a way that is gradual and not easily noticed the pernicious influence of TV violence on children Ageism is equally as offensive and pernicious as sexism. Word Originlate Middle English: from Latin perniciosus ‘destructive’, from pernicies ‘ruin’, based on nex, nec- ‘death’.
See the Oxford Advanced American Dictionary entry: pernicious