Source : Webster's Revised Unabridged Dictionary (1913)

Injurious \In*ju"ri*ous\, a. [L. injuriousus, injurius; cf. F.
   injurieux. See {Injury}.]
   1. Not just; wrongful; iniquitous; culpable. [Obs.] --Milton.

            Till the injurious Roman did extort This tribute
            from us, we were free.                --Shak.

   2. Causing injury or harm; hurtful; harmful; detrimental;
      mischievous; as, acts injurious to health, credit,
      reputation, property, etc.

            Without being injurious to the memory of our English
            Pindar.                               --Dryden.

   Syn: Harmful; hurtful; pernicious; mischievous; baneful;
        deleterious; noxious; ruinous; detrimental.

Source : WordNet®

injurious
     adj 1: harmful to living things; "deleterious chemical additives"
            [syn: {deleterious}, {hurtful}]
     2: tending to cause great harm [syn: {evil}, {harmful}]