Translation guide
The English word "amorphous" describes something without a clear shape, form, or structure. In Japanese, the most natural translation depends on whether you're talking about physical objects, abstract concepts, or scientific contexts.
amorphous (general)
Most common translation for physical and abstract lack of shape.
amorphous (vague, abstract)
Best for ideas, plans, or feelings.
amorphous (scientific)
Use in physics or materials science.
Describing physical things that have no fixed or clear shape, like blobs, clouds, or soft materials.
The most direct and common translation for 'amorphous' in general contexts. It literally means 'indefinite shape' and is used for physical objects, abstract concepts, and in technical fields.
The amorphous object moved slowly.
Similar to 不定形 but slightly more formal or literary. Often used in scientific or philosophical contexts.
A natural, everyday phrase meaning 'the shape is not clear'. Useful in casual conversation when you want to avoid technical terms.
Describing ideas, plans, organizations, or systems that are vague, unstructured, or not well-defined.
Means 'vague' or 'ambiguous'. It is the most natural choice for abstract concepts like ideas, feelings, or plans that lack clear definition.
His proposal was amorphous and lacked specifics.
Means 'unclear' or 'obscure'. Often used for explanations, boundaries, or definitions that are not distinct.
A very common and versatile phrase meaning 'not clear' or 'vague'. Suitable for both casual and semi-formal contexts.
In physics or materials science, describing a solid that lacks a crystalline structure, like glass or some plastics.
The direct loanword from English, used almost exclusively in scientific and technical contexts. It is the standard term in Japanese for amorphous materials.
Amorphous silicon is used in solar cells.
The native Japanese technical term meaning 'non-crystalline'. Used in academic papers and formal scientific writing.
When describing something like an 'amorphous plan', do not use 不定形 (which sounds like a physical shape). Instead, use 漠然とした or はっきりしない to convey vagueness.
an amorphous plan
Both mean 'amorphous', but 不定形 is more common in everyday and general contexts, while 無定形 is slightly more formal and often appears in scientific or philosophical writing. In most cases, 不定形 is the safer choice.
An amorphous substance solidified in the test tube.
The cloud was amorphous and hazy.
The organization's structure is amorphous, and it's unclear who is in charge.
What he's saying is amorphous and hard to understand.
Because this material is amorphous, it does not show an X-ray diffraction pattern.