fluid

US /ˈfluː.ɪd/
UK /ˈfluː.ɪd/
"fluid" picture
1.

a substance that has no fixed shape and yields easily to external pressure; a gas or (especially) a liquid.

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Water is a common fluid.
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The car needs more brake fluid.
:
liquidgassolutionmediumsubstance
1.

not solid or fixed in form; able to flow easily.

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The paint was still fluid and easy to spread.
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The lava flowed in a slow, viscous fluid stream.
:
liquidflowingrunnyviscous
:
solidfixed
2.

smooth and continuous.

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Her movements were graceful and fluid.
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The conversation was very fluid, moving from one topic to another easily.
:
smoothgracefuleffortlesscontinuous
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jerkyabrupt
3.

liable to change or vary.

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The situation is still very fluid.
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Their plans for the trip are quite fluid.
:
changeablevariableflexibleadaptable
:
fixedstablerigid
:
cerebrospinal fluidseminal fluidamniotic fluidfluid ouncecorrection fluid