Which preposition to use with saturnine

as Occurrences 1%

Dark and saturnine as ever, he glided out into the path in front of me, thrusting something back into the sash around his waist, moved toward me, and took my horse's head.

at Occurrences 1%

With his well-seared conscience, he neither felt nervous nor saturnine at the prospect of what was before himwhy should he indeed?for the only part of the prospect he fixed his eye upon was the gain; the little operation by means of which it was to be acquired, he did not think very seriously of; besides, he did not intend to perform it himself.

than Occurrences 1%

His person is well described by his biographer, Miss Seward, as being above the middle size, his form athletic, and his limbs too heavy for exact proportion; his countenance marked by the traces of a severe small-pox, and, when not animated by social pleasure, rather saturnine than sprightly.

Which preposition to use with  saturnine