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.
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.
その不定形の物体はゆっくりと動いた。
The amorphous object moved slowly.
Similar to 不定形 but slightly more formal or literary. Often used in scientific or philosophical contexts.
無定形の物質が試験管の中で固まった。
An amorphous substance solidified in the test tube.
A natural, everyday phrase meaning 'the shape is not clear'. Useful in casual conversation when you want to avoid technical terms.
その雲は形がはっきりしなくて、ぼんやりしていた。
The cloud was amorphous and hazy.
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.
彼の提案は漠然としていて、具体性に欠けていた。
His proposal was amorphous and lacked specifics.
Means 'unclear' or 'obscure'. Often used for explanations, boundaries, or definitions that are not distinct.
組織の構造が不明瞭で、誰が責任者かわからない。
The organization's structure is amorphous, and it's unclear who is in charge.
A very common and versatile phrase meaning 'not clear' or 'vague'. Suitable for both casual and semi-formal contexts.
彼の言っていることははっきりしなくて、理解しにくい。
What he's saying is amorphous and hard to understand.
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.
アモルファスシリコンは太陽電池に使われる。
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.
漠然とした計画
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.
この物質は非晶質であるため、X線回折パターンを示さない。
Because this material is amorphous, it does not show an X-ray diffraction pattern.