He looked up loweringly.    From Wordnet, Princeton University. 

Adjective : lowering skies.    From Dictionary.com. 

He looked loweringly at me for a moment from under his shaggy eyebrows.    From Wordnik.com.  [Blackwood's Edinburgh Magazine - Volume 54, No. 338, December 1843] Reference

He stared loweringly at his father and devotedly at Simon Begg, who merely looked bored and slightly worried.    From Wordnik.com.  [Death of a Fool]

Watchfully he waited there -- curiously still, his head jutting forward loweringly from between his huge shoulders.    From Wordnik.com.  [The Luck of the Mounted A Tale of the Royal Northwest Mounted Police] Reference

A green suit humped up from the ruck, the huge helmet swinging loweringly towards him, the visor up and the face­plate swung open.    From Wordnik.com.  [Behold the Stars]

The sun was no longer visible; a chilling wind had sprung up from the east; dull gray clouds hung loweringly overhead; a close mist, as of coming rain, wrapped the landscape as in a mantle.    From Wordnik.com.  [Two Little Travellers A Story for Girls] Reference

I placed the wallflower in the open window, where a ray of sunshine bid it welcome; the birds were singing around, the sky had cleared up, and the day, which began so loweringly, had become bright.    From Wordnik.com.  [The French Immortals Series — Complete] Reference

'I've had trouble with them boys over to my place, Colonel,' he said, briefly, and looking loweringly around, as though he would be disposed to resent any listening to his report on the part of the negroes.    From Wordnik.com.  [The Continental Monthly, Vol. 3, No. 1 January 1863 Devoted To Literature And National Policy] Reference

Leaning on his stick, he looked loweringly back at.    From Wordnik.com.  [The Street Called Straight] Reference

I was the next upon whom the eye of the police-sergeant loweringly fell.    From Wordnik.com.  [Faces and Places] Reference

'No -- a, Beauty; it baint,' replied the girl, loweringly, and without stirring.    From Wordnik.com.  [Uncle Silas A Tale of Bartram-Haugh] Reference

Sol shut the door, drew up an inverted tub, seated himself upon it, and looked about, loweringly.    From Wordnik.com.  [The Young Mountaineers Short Stories] Reference

Then aloud, "Whar's mam?" he demanded, flinging himself into a chair and looking loweringly about.    From Wordnik.com.  [His "Day In Court" 1895] Reference

She saw him glance out at the soldier loweringly and after that he grew more morose, almost sullenly so.    From Wordnik.com.  [The Visioning] Reference

He took it, standing at the littered bar, and looked loweringly at a man who stood where Riderhood had stood that early morning.    From Wordnik.com.  [Our Mutual Friend] Reference

His right hand grasped the upper portion of the velvet cross, partly detached from his doublet, and he looked loweringly upon her.    From Wordnik.com.  [The Strong Arm] Reference

He paused and looked loweringly at the interrupter under his shaggy brows, pulling his under lip into his mouth in a moment of grim resolve.    From Wordnik.com.  [Bog-Myrtle and Peat Tales Chiefly of Galloway Gathered from the Years 1889 to 1895] Reference

His visitor looked loweringly at him, and then with a quick eye, seemed to measure the distance from where he stood to the pavement, evidently meditating flight.    From Wordnik.com.  [Revenge!] Reference

Farther conversation was suspended by a few heavy drops which fell upon us; the cloud had passed over the moon, and was hastening rapidly and loweringly over our heads.    From Wordnik.com.  [Pelham — Complete] Reference

When he looked loweringly up, quivering at each sound, his eyes had the expression of those of a criminal who thinks his guilt and his punishment great, and knows that he can find no words.    From Wordnik.com.  [The Red Badge of Courage] Reference

When he looked loweringly up, quivering at each sound, his eyes had the expression of those of a criminal who thinks his guilt little and his punishment great, and knows that he can find no words.    From Wordnik.com.  [The Red Badge of Courage] Reference

Charles Nagle's brown eyes shone with anger; he looked loweringly at his companions, and they, a beautiful young woman and an old man dressed in the sober garb of a Catholic ecclesiastic of that day, glanced at one another apprehensively.    From Wordnik.com.  [Studies in love and in terror] Reference

Lacaille, on the other hand, was embittered; his hair was already grizzling; and, bent and wearied by his ceaseless perambulations through the streets of Paris, he would at times glance loweringly at the placid figure of Robine, and his sound boots and heavy coat.    From Wordnik.com.  [The Fat and the Thin] Reference

The day was remarkably still and close; the sun had not once pierced through the dull atmosphere, which was charged with the yet silent but gathering thunder; and as the evening came on, the sullen tokens of an approaching storm became more and more loweringly pronounced.    From Wordnik.com.  [Godolphin, Complete] Reference

Witanbury Close: over the Deanery, where the cherished youngest daughter tried in vain to be "brave," and to conceal her miserable state of suspense from her father and mother; over "Robey's," all of whose young men were in the Expeditionary Force; and very loweringly over the.    From Wordnik.com.  [Good Old Anna] Reference

They are like the colossal strides of approaching Fate, and this awfulness is twice raised to a higher power, first by a searching, syncopated phrase in the violins which hovers loweringly over them, and next by a succession of afrighted minor scales ascending crescendo and descending piano, the change in dynamics beginning abruptly as the crest of each terrifying wave is reached.    From Wordnik.com.  [A Book of Operas Their Histories, Their Plots, and Their Music] Reference

She was loweringly aware that he could have taken matters much further, but hadn’t.    From Wordnik.com.  [A Lady of His Own]

A very different man from this rough-looking, ill-dressed colonial, staring at her so loweringly.    From Wordnik.com.  [The Red House Mystery] Reference

"There is a place," the boy would declaim loweringly, and with fitting gesture, with hypnotic eye fastened on the cowering Bernal, "where the only music is the symphony of damned souls.    From Wordnik.com.  [The Seeker] Reference

A long and bleak moor, which was the entrance to that beautiful line of country in which the valleys around Grassdale are embosomed: faster and faster came the rain; and though the thunder-clouds were now behind, they yet followed loweringly, in their black array, the path of the lonely horseman.    From Wordnik.com.  [Eugene Aram — Complete] Reference

"Slurrrrs?" he repeated loweringly.    From Wordnik.com.  [Widdershins] Reference

“No-a, Beauty; it baint,” replied the girl, loweringly, and without stirring.    From Wordnik.com.  [Uncle Silas] Reference