Difference between Saturnine and Glowering

SATURNINE vs GLOWERING: ADJECTIVE

Showing a brooding ill humor
Having the temperament of one born under the supposed astrological influence of Saturn.
Melancholy or sullen.
Having or marked by a tendency to be bitter or sardonic.
Produced by absorption of lead.
Born under, or influenced by, the planet Saturn.
Bitter or scornful
Of or pertaining to lead; characterized by, or resembling, lead, which was formerly called Saturn.
Lead colic.
Of or born under Saturn's influence
Containing lead, or suffering from lead poisoning (saturnia)
Cold and slow to change and react (refers to mood)
Gloomy, depressed, dull
Sardonic, bitter, disdainful
Heavy; grave; gloomy; dull; -- the opposite of mercurial.

Pertaining to the god Saturn or the planet Saturn; under the influence of the planet Saturn.
[lowercase] Morose; dull; heavy; grave; not readily susceptible to excitement or cheerfulness; phlegmatic.
[lowercase] Arousing no interest; stupid; dull; uninteresting.
[lowercase] In old chemistry, pertaining to lead: as, saturnine compounds.

Sardonic, Tenebrous, Taciturn, Melancholy, Lugubrious, Ill natured, Sour, Glum, Sarcastic, Dark, Dour, Sullen, Morose, Glowering, Moody

Gazes, Brooding, Stare, Leering, Smirking, Scowling, Ill natured, Sour, Dark, Glum, Dour, Moody, Morose, Saturnine, Sullen

Sardonic, Tenebrous, Taciturn, Melancholy, Lugubrious, Ill natured, Sour, Glum, Sarcastic, Dark, Dour, Sullen, Morose, Glowering, Moody

Gazes, Brooding, Stare, Leering, Smirking, Scowling, Ill natured, Sour, Dark, Glum, Dour, Moody, Morose, Saturnine, Sullen

But the unmitigated Hunt never ceased his overflowing anticipations, nor the saturnine Carlyle his infinite demurs to those finite flourishings.
Richard Kestrel was a renowned poker player and his face, dark and saturnine, revealed nothing of his feelings.
The face was saturnine and swarthy, and the sensual lips seemed to be twisted with disdain.
During the above, JUDGE TURPIN, an elderly man with a saturnine demeanor, eyes Lucy through the luxurious bunches of flowers.
Father Brown seemed rather to like the saturnine candour of the soldier.
The old man lives in the saturnine apartment.

On the way back, right to left like no aircraft Stotter had ever seen, sweating and glowering.
My paternal grandmother was mostly depressive and I simply remember her as a glowering, complaint presence.
Will Mellor makes for a glowering knight Valiant, but his motives are never made clear.
She could not explain the unbreakable bond between them, glowering at him.
The wounded cat dropped to its belly, glowering with pain and anger.
Frank Castle glowering at the viewer with his uzi smoking.
Then he sat in the back row just glowering.
The younger cop sinks back into his seat, glowering.
Spencer Trilby stands glowering as he talks to Harry.
Chase exclaimed, glowering at her with feigned anger.