... “There are cancers so insidious in their nature that their very pulsations cannot be felt... 
Alexandre Dumas, Pere 「Louise de la Valliere」
...Morison was a past master in the art of insidious boasting...
Edgar Rice Burroughs 「The Son of Tarzan」
...While Isabella, with a weary heart, was passing sleepless nightsthinking only of her daughter and Henry, the latter was seeking reliefin that insidious enemy of the human race, the intoxicating cup...
William Wells Brown 「Clotelle: a Tale of the Southern States」
...Thus Demeter of the hymn, far from beingidentical with the Earth-goddess, must have regarded that divinityas her worst enemy, since it was to her insidious wiles that sheowed the loss of her daughter...
Sir James George Frazer 「The Golden Bough」
...Having been honoured, like other strangers, with a place on theplatform, I did not myself detect Lucifer at work among themultitude below; I merely suspected his insidious presence...
Sir James George Frazer 「Balder The Beautiful, Vol. I.」
...They have still more deadly foesin parasites, some of which attack the fully developed locust, but thegreater number adopt the more insidious method of attacking the eggs...
Various 「Argentina From A British Point Of View」
...But his last shred of reserve strength had nearly been sapped now bythe insidious rays of that malevolent green moon...
Various 「Astounding Stories, May, 1931」
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