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lacking definite form; having no specific shape; formless:
the amorphous clouds.
of no particular kind or character; indeterminate; having no pattern or structure; unorganized:
an amorphous style; an amorphous personality.
Petrography, Mineralogy. occurring in a mass, as without stratification or crystalline structure.
Chemistry. not crystalline.
Biology. having structural components that are not clearly differentiated, as the nuclear material in certain bacteria.
Contemporary Examples

How and what makes this amorphous movement step in this direction or that?
Anonymous’s Next Move Winston Ross April 16, 2013

But for the fashion world, where trends are amorphous and tastes constantly shifting, the franchise is serious business.
Carrie’s Battle of the Brands Rebecca Dana May 19, 2010

Most of them were lying in pieces, a mélange of limbs, and torsos amongst loose organs and amorphous chucks of flesh.
The Extinction Parade: An Original Zombie Story by Max Brooks Max Brooks January 13, 2011

Not in tax dollars, not in national resources, not even in the amorphous concept of a body count.
In War, What Remains Artis Henderson January 6, 2014

But the amorphous blend of character and character motivation somehow morphs into plot.
How I Write: James McBride, The New National Book Award Winner For Fiction Noah Charney December 3, 2013

Historical Examples

These are (a) amorphous substances, (b) fibers, and (c) cells.
Special Report on Diseases of the Horse United States Department of Agriculture

It is impossible to ignite there a fragment of amorphous phosphorus.
Fragments of science, V. 1-2 John Tyndall

An amorphous form results when a mixture of iron filings and sulphur are triturated with water.
Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 7 Various

There are two general forms—the crystalline and the amorphous.
Appletons’ Popular Science Monthly, October 1899 Various

In the free state carbon occurs in three allotropic forms, two of which are crystalline and one amorphous.
An Elementary Study of Chemistry William McPherson

adjective
lacking a definite shape; formless
of no recognizable character or type
(of chemicals, rocks, etc) not having a crystalline structure
adjective

See amorphic
adj.

“shapeless,” 1731, from Modern Latin amorphus, from Greek amorphos “without form, shapeless, deformed,” from a- “without” (see a- (3)) + morphe “form” (see Morpheus). Related: Amorphously; amorphousness.

amorphous a·mor·phous (ə-môr’fəs)
adj.

Lacking definite form; shapeless.

Lacking organization; formless.

Lacking distinct crystalline structure.

amorphous
(ə-môr’fəs)

Not made of crystals. Glass, amber, and plastics are amorphous substances.

Lacking definite form or shape.