This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
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adj. Difficult or impossible to coerce or control forcibly: incoercible rebel leaders.

adj. Not to be coerced; incapable of being compelled or forced.

adj. Not capable of being reduced to liquid form by pressure.

adj. That cannot be confined in, or excluded from, vessels, like ordinary fluids, gases, etc.; said of heat, light, electricity, etc.

adj. Not to be coerced; incapable of being compelled or forced.

adj. Not capable of being reduced to the form of a liquid by pressure; -- said of any gas above its critical temperature.

adj. That can note be confined in, or excluded from, vessels, like ordinary fluids, gases, etc.; -- said of the imponderable fluids, heat, light, electricity, etc.

Not to be coerced or compelled; incapable of being constrained or forced.

In physics, incapable of being reduced to a liquid form by any amount of pressure. Certain gases were formerly supposed to have this property. See gas.

In physical:

Incapable of reduction to tangible condition by pressure: applied to forms of energy, such as heat and electricity, when they were thought of as extremely subtile fluids.

"Pacific Ocean shall pour into the Atlantic; when man will become more precious than fine gold, and when his ambition will be to subdue the elements, not to subjugate his fellow-creatures, to make fire, water, earth and air obey his bidding, but to leave the poor ethereal mind as the sole thing in Nature free and incoercible."

critical temperature   

unyielding