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]

Moby Thesaurus II by Grady Ward, 1.0:

80 Moby Thesaurus words for "injurious":
   abusive, adverse, bad, bad for, baleful, baneful, calumnious,
   contaminated, contemptuous, corroding, corrosive, corrupting,
   corruptive, counterproductive, damaging, deadly, defamatory,
   deleterious, deprecatory, derogatory, destructive, detrimental,
   disadvantageous, disparaging, disserviceable, distressing, eroding,
   erosive, evil, foul, harmful, harsh, hurtful, insalubrious,
   insanitary, insulting, lethal, malefic, malevolent, malign,
   malignant, mischievous, morbific, noisome, noxious, offensive,
   ominous, pathogenic, peccant, pernicious, pestiferous, poisonous,
   polluted, prejudicial, ruinous, scandalous, scatheful, scornful,
   scurrilous, septic, slanderous, tainted, toxic, unadvantageous,
   unfavorable, unhealthful, unhealthy, unhygienic, unprofitable,
   unrewarding, unsanitary, unwholesome, useless, venenate,
   veneniferous, venenous, venomous, vicious, virulent, worthless