mindmap root((有害)) pernicious implies irreparable harm done through evil or insidious corrupting or undermining: the claim that pornography has a ~ effect on society. baneful implies injury through poisoning or destroying influence: the ~ notion that discipline destroys creativity. noxious applies to what is both offensive and injurious to the health of body or mind: ~ fumes emanating from a chemical plant. deleterious applies to what has an often unsuspected or unanticipated harmful effect, especially on the living body: megadoses of vitamins can have ~ effects. detrimental implies something obviously, but not necessarily extremely, harmful to the thing it affects: the ~ effects of prolonged fasting.