Causing harm in a way that is gradual or not easily noticed
Examples:
Her insidious plan unfolded slowly over the years.The disease's insidious nature made it hard to detect.He discovered the insidious effects of staying still too long.
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Antonyms:
Invidious
/ɪnˈvɪdiəs/
Causing envy or resentment in others
Examples:
The policy puts minorities in an invidious situation.His invidious remarks caused tension in the team.She made an invidious comparison between the two groups.
Synonyms:
Antonyms:
Ways to tell them apart:
Insidious refers to something harmful working in a subtle or stealthy way, while invidious describes something likely to cause resentment or ill will.
Remember insidious with the idea of inside as it often involves something harmful but hidden.
Think of invidious in terms of envy, as it relates to arousing envy or resentment in others.