Some substances are more toxic than others. The toxicity of a substance is described by the types of effects it causes and its potency. 1  Types of Effects: Different chemicals cause different effects.
I think I remember reading that injured means bruises and lascerations, seriously injured meant hospital but not life threatening, critically injured meant hospital ICU time and fatally injured meant injuries leading to dying sometime later.
injure, harm, hurt, damage, impair, mar mean to affect injuriously. injure implies the inflicting of anything detrimental to one's looks, comfort, health, or success. badly injured in an accident; harm often stresses the inflicting of pain, suffering, or loss. careful not to harm the animals