Jane Eyre vocabulary

Zillah; who ever and anon interrupted her labour to pluck up the corner of her apron, and heave an indignant groan.

Emily Brontë. Wuthering Heights (1847)

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Yet was there a sort of indefinite, half-attained, unimaginable sublimity about it that fairly froze you to it, till you involuntarily took an oath with yourself to find out what that marvellous painting meant. Ever and anon a bright, but, alas, deceptive idea would dart you through.— It's the Black Sea in a midnight gale.— It's the unnatural combat of the four primal elements.— It's a blasted heath.— It's a Hyperborean winter scene.—

Herman Melville. Moby Dick

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In the matter of eyes, also, my acquaintance was pre-eminently endowed. Either one of such a pair was worth a couple of the ordinary ocular organs. They were of a deep hazel, exceedingly large and lustrous; and there was perceptible about them, ever and anon, just that amount of interesting obliquity which gives pregnancy to expression.

Edgar Allan Poe. The Works of Edgar Allan Poe — Volume 4: Loss of Breath (1832)