Insidious means the gradual onslaught of an illness or disease in such a manner that it is entrenched before being discovered: “The insidious effects of polluted water and air come to the surface in the shape of serious diseases.”
Invidious , on the other hand, means that which may cause discontent, envy, jealousy, or resentment: “It would be invidious to say which actor performed the best when all the actors had acted in a most convincing manner.”

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