flammable
Americanadjective
adjective
Usage
Flammable and inflammable are interchangeable when used of the properties of materials. Flammable is, however, often preferred for warning labels as there is less likelihood of misunderstanding ( inflammable being sometimes taken to mean not flammable ). Inflammable is preferred in figurative contexts: this could prove to be an inflammable situation
Commonly Confused
See inflammable.
Other Word Forms
Etymology
Origin of flammable
First recorded in 1805–15; from Latin flammā(re) “to set on fire” + -ble
Explanation
Be careful with matches around gasoline, dry grass, and old wood because they are all very flammable and might catch on fire. Flammable is a pretty straightforward word with one odd fact about it. The word, inflammable, which sounds like the opposite of flammable, actually means the same thing — easily catching on fire. If you want to say that something won't catch fire easily, use fireproof and you'll be sure to be right.
Vocabulary lists containing flammable
Power Suffix: -able
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List 6
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Hatchet
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The footwear industry can be especially susceptible to fires because shoes use flammable materials such as rubber and synthetic fabrics.
From The Wall Street Journal • Jul. 10, 2026
Initial reports suggest the fire may have started on the factory's ground floor where flammable materials were stored.
From BBC • Jul. 9, 2026
But over the nearly one-and-a-half years since the 2025 mega-fires, native and invasive grasses, bushes and trees have begun to regrow, weaving flammable greenery across the landscape.
From Los Angeles Times • Jun. 26, 2026
What sparked the early-morning blaze is not yet known, but an initial investigation found the flames spread quickly due to wind conditions and the flammable nature of the thatched roofs on some buildings.
From BBC • Jun. 20, 2026
“Gee, that went well,” Adina snarked to Mary Lou as they searched for anything remotely flammable.
From "Beauty Queens" by Libba Bray
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
