The Collaborative International Dictionary of English v.0.48:

Injurious \In*ju"ri*ous\, a. [L. injuriousus, injurius; cf. F.
   injurieux. See Injury.]
   1. Not just; wrongful; iniquitous; culpable. [Obs.] --Milton.
      [1913 Webster]

            Till the injurious Roman did extort
            This tribute from us, we were free.   --Shak.
      [1913 Webster]

   2. Causing injury or harm; hurtful; harmful; detrimental;
      mischievous; as, acts injurious to health, credit,
      reputation, property, etc.
      [1913 Webster]

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

   Syn: Harmful; hurtful; pernicious; mischievous; baneful;
        deleterious; noxious; ruinous; detrimental.
        [1913 Webster]

WordNet (r) 3.0 (2006):

injurious
    adj 1: harmful to living things; "deleterious chemical
           additives" [syn: deleterious, hurtful, injurious]