subtile

Recent scientific discoveries have conferred upon man new powers of investigation, whereby nature has been made to reveal secrets so subtile that they never had been dreamt of before in philosophy.

From Scientific American ● Jan. 13, 2013

At Paris the Universe is seen, compos’d of Vortices of subtile Matter; but nothing like it is seen in London.

From "The Invention of Science" by David Wootton

Nor wanting was the choral song, Swelling in silvery chimes of sweetness; To sound of which this subtile throng Advanced in playful grace and fleetness.

From Fairy Legends and Traditions of The South of Ireland by T. Crofton Crocker

Sub′tilise, to make subtile, thin, or rare: to spin into niceties.—v.i. to make nice distinctions: to refine in argument.—ns.

From Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) by Various

Every plant and shrub will have some part in a subtile and soothing ministry; and then, if ever, it will occur to you that this is a mellow old world after all.

From A Breeze from the Woods, 2nd Ed. by William Chauncey Bartlett

That cause of motion he makes the Materia Subtilis; and the finer or subtiler that is, the better and fitter he conceives it to be to preserve Motion.

From Philosophical Transactions of the Royal Society - Vol 1 - 1666 Giving some Accompt of the present Undertakings, Studies, and Labours of the Ingenious in many considerable parts of the World by Henry Oldenburg

Gradually he wove a drama round it; line by line it took shape for a book that was to be subtiler, finer and more sincere than anything that he had ever written.

From The Education of Eric Lane by Stephen McKenna

Is not the Heat of the warm Room convey'd through the Vacuum by the Vibrations of a much subtiler Medium than Air, which after the Air was drawn out remained in the Vacuum?

From Opticks or, a Treatise of the Reflections, Refractions, Inflections, and Colours of Light by Sir Isaac Newton

Bread is a binder, and for that abolisht even in their Ale, whose lost room fills an apple, which is more airy and of subtiler nature.

From The Scornful Lady by John Fletcher

No, his temperament needed a subtiler atmosphere than this, rarer essence than mere brutal freedom.

From The Atlantic Monthly, Volume 08, No. 50, December, 1861 by Various

I can say, from an experience of over a dozen years, that pupils between twelve and fifteen years of age are immensely interested in such discussions, and are capable of making the subtilest distinctions.

From The Moral Instruction of Children by Felix Adler

At some far-away period in childhood it got imbedded in my fancy, and in process of time had acquired that subtilest, indefinable fascination which belongs only to imaginative reminiscence.

From The Atlantic Monthly, Volume 15, No. 88, February, 1865 by Various

Of the most noysom poyson that euer was mingled with the subtilest druggs that euer were.

From The Palace of Pleasure Volume 3 by William Painter

It was this mastery of the interior life, this impassioned voicing of its subtilest secrets, that made Rousseau so irresistibly attractive to women.

From The Friendships of Women by William Rounseville Alger

He saw it was lovable, and he made it the theme of his noblest poems, his subtilest philosophies, and his highest Art.

From The Atlantic Monthly, Volume 07, No. 44, June, 1861 Creator by Various