ضارّ: مُضِر، مُؤْذٍ harmful, injurious, detrimental, prejudicial, hurtful, noxious, damaging, deleterious, nocuous, obnoxious, evil, maleficent, inimical, adverse, unhealthy, unwholesome

غَيْرُ ضارّ harmless, unharmful, innoxious, innocuous, inoffensive, safe, good