"he confuses the reader with ill-defined terms and concepts"
同义词： unclear
以上来源于: WordNet
ADJ If you describe something as ill-defined, you mean that its exact nature or extent is not as clear as it should be or could be. 不清晰的; 不明确的
...staff with ill-defined responsiblities.
...员工的职责划分不够清晰。
unclear , vague
So that's ill-defined and the same is true for the acceleration.
因此无法定义速度，加速度也是一样。
youdao
But the issue of what constitutes a subsidy remains somewhat ill-defined.
但是关于补贴的形式，依然很不明确。
The ugly new, ill-defined buzzword will be “macro-prudential” supervision.
新出现的、难听而又含义模糊的时髦词将会是“广为谨慎的”监管。
In most parts of the developing world, control over resources at the village level is ill-defined.
ECONOMIST: Local difficulties
When an organization lacks a clear destination, it usually has many ill-defined ones.
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The fears about loss of privacy expressed by some consumers have always been a little ill-defined and overly general.
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