...He would cut out all the broad play, all the usual clowning which had delighted their past rude audiences, and he would obtain his effects by subtlety instead... 
Rafael Sabatini 「Scaramouche」
... “I admire your subtlety of expression, mademoiselle,” said Raoul, making an effort to remain calm...
Alexandre Dumas, Pere 「Louise de la Valliere」
...He marvelled at the subtlety of her mind, and she at the relentlessness of his...
W. E. B. Du Bois 「The Quest of the Silver Fleece」
...”This a subtlety to lether know that I understood why shewas seeking me...
Various 「Ainslee's magazine, Volume 16, No. 2, September, 1905」
...An extraordinary case of this pernicious influence, which is related byHartmann, who observed this epizootia at its decline in 1756, will givean idea of the subtlety of this malignant virus...
Honoré Bourguignon 「On the cattle plague: or, Contagious typhus in horned cattle. Its history, origin, description, and treatment」
...There is, however, a subtlety in the investigations of mathematicswhich, in this instance at all events, transcends the most delicateobservations which our instruments enable us to make...
Robert Stawell Ball 「The Story of the Heavens」
...The very fowls that laid out-bush gained nothing by their subtlety...
Jeanie “Mrs. Aeneas” Gunn 「We of the Never-Never」
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