Last Updated
：2025/11/20
insidious
IPA(Pronunciation)
Adjective
nonstandard
Japanese Meaning
徐々にひそかに害を及ぼす / 罠にかける意図があり、一見魅力的であるが実は有害な / 裏切り的な、ずる賢い
（ comparative ）
（ superlative ）
Quizzes for review
Producing harm in a stealthy, often gradual, manner. / Intending to entrap; alluring but harmful. / (nonstandard) Treacherous.
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insidious
The insidious mold spread behind the walls, slowly weakening the house's structure before anyone noticed.
See correct answer
The insidious mold spread behind the walls, slowly weakening the house's structure before anyone noticed.
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