The Collaborative International Dictionary of English v.0.48:

Inflammable \In*flam"ma*ble\, a. [CF. F. inflammable.]
   1. Capable of being easily set fire; easily enkindled;
      combustible; as, inflammable oils or spirits.
      [1913 Webster]

   2. Excitable; irritable; irascible; easily provoked; as, an
      inflammable temper.
      [1913 Webster]

   Inflammable air, the old chemical name for hydrogen.
      [1913 Webster]

WordNet (r) 3.0 (2006):

inflammable
    adj 1: easily ignited [syn: flammable, inflammable]

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "inflammable":
   accendible, agitable, alcohol, benzine, briquette, burnable,
   butane, carbon, charcoal, coal, coke, combustible, dope, edgy,
   emotional, emotionally unstable, eruptive, ethane, ethanol,
   excitable, explosive, fiery, fireball, firing, flammable,
   flammable material, fuel, fuel additive, fuel dope, gas,
   gas carbon, gasoline, heptane, hexane, high-mettled, high-spirited,
   high-strung, highly emotional, inflammable material, irascible,
   irritable, isooctane, jet fuel, kerosene, methane, methanol,
   mettlesome, natural gas, nervous, octane, oil, paraffin, peat,
   pentane, perturbable, prickly, propane, propellant, rocket fuel,
   sensitive, skittish, startlish, touchy, turf, volcanic