noun-modifying (irregular)
pseudo-; quasi-; false; mock; sham
Used as a prenominal modifier to describe something that resembles the real thing but is not genuine. Common in technical and everyday contexts.
疑似科学には注意が必要だ。
We need to be careful with pseudoscience.
このアプリは疑似体験ができる。
This app lets you have a simulated experience.
noun-modifying (irregular)
suspected (case of disease)
Medical or epidemiological term for a case that is suspected but not yet confirmed. Often used in phrases like 疑似症 (suspected case) or 疑似患者 (suspected patient).
疑似症患者の報告が増えている。
Reports of suspected cases are increasing.
偽 (にせ) means 'fake' or 'imitation' and is used as a noun or prefix, often with a stronger connotation of deliberate deception. 疑似 is more neutral and technical, focusing on resemblance rather than intent to deceive.
模擬 (もぎ) means 'simulation' or 'mock' and is used for practice or imitation scenarios (e.g., 模擬試験 mock exam). 疑似 is broader and can refer to anything that is pseudo- or quasi-, not necessarily for practice.
Compound of 疑 (doubt, suspect) and 似 (resemble). The spelling 疑似 is standard; 擬似 uses a variant kanji with a similar meaning. The word is a Sino-Japanese term (kango).