Which preposition to use with unforgettable

of Occurrences 2%

Viewed by day, say from the deck of a river steamer, the spectacle they offered was, according to bias of mood and disposition, unlovely and drear or colourful and romantic: Whistler might have etched these houses, Dickens have staged therein a lowly tragedy, Thomas Burke have made of one a frame for some vignette unforgettable of Limehouse life.

as Occurrences 1%

There is a little dark fellow in the Brera at Milan whose zeal in displaying the merits of Mantegna's foreshortened Christ is as unforgettable as a striking piece of character-acting in a theatre.

for Occurrences 1%

In the very first place, he had been unforgettable for two reasonsbecause he had been so struck at sight of her that he had gazed unconsciously, with a glow on his face and a radiance in his eye, as of a young poet spellbound at an inspiration; and because he seemed the physical type of young man she had idealizeda strong, lithe-limbed, blond giant, with a handsome, frank face, clear-cut and smooth, ruddy-cheeked and blue-eyed.

Which preposition to use with  unforgettable