amorphous

UK: /əˈmɔː^rfəs/ US: /əˈmɔrfəs/ ,(ə môr′fəs)

WordReference Random House Learner's Dictionary of American English © 2025

a•mor•phous /əˈmɔrfəs/   adj. 

1. lacking definite form;
   shapeless:
   amorphous clouds.
2. of no particular kind or character;
   unstructured;
   unorganized:
   his amorphous style of writing.

a•mor•phous•ly, adv. 
a•mor•phous•ness, n. [uncountable] See -morph-.

WordReference Random House Unabridged Dictionary of American English © 2025

a•mor•phous  (ə môr′fəs), adj. 

1. lacking definite form;
   having no specific shape;
   formless:
   the amorphous clouds.
2. of no particular kind or character;
   indeterminate;
   having no pattern or structure;
   unorganized:
   an amorphous style; an amorphous personality.
3. Mineralogy, Rocks [Petrog., Mineral.] occurring in a mass, as without stratification or crystalline structure.
4. Chemistry not crystalline.
5. Biology having structural components that are not clearly differentiated, as the nuclear material in certain bacteria.

• Greek ámorphos shapeless. See a-⁶, -morph, -ous
• 1725–35

a•mor′phous•ly, adv. 
a•mor′phous•ness, n. 
Synonyms

• 1, 2. shapeless, undefined; vague, anomalous.

Collins Concise English Dictionary © HarperCollins Publishers::

amorphous / əˈmɔːfəs/ adjective

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

Etymology: 18th Century: from New Latin, from Greek amorphos shapeless, from a-¹ + morphē shape

aˈmorphism noun

aˈmorphousness noun