Definition from Wiktionary, the free dictionary
- Capable of burning; easily set on fire.
- (figuratively) Easily excited; set off by the slightest excuse; easily enraged or inflamed.
Usage notes 
- Inflammable can be misinterpreted as an antonym of flammable and so taken to have the opposite meaning to that intended. Where such confusion might arise, especially where this may be a safety hazard, one may prefer to use flammable or another synonym.
- (capable of burning): fireproof, incombustible, non-flammable
- (easily excited): level-headed, unflappable
Related terms 
capable of burning
- inflammable in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
- inflammable in The Century Dictionary, The Century Co., New York, 1911
inflammable (masculine and feminine, plural inflammables)