Douglas Harper's Etymology Dictionary
1828, from un- (1) "not" + presentable (adj.).
Wiktionary
a. Not presentable.
WordNet
adj. creating an unfavorable or neutral first impression [syn: unprepossessing]
Usage examples of "unpresentable".
Woloda, apparently, was of the same opinion, for he begged me to undo the curls, and when I had done so and still looked unpresentable, he ceased to regard me at all, but throughout the drive to the Kornakoffs remained silent and depressed.
There it was that the said Samuel once had his dinner handed to him behind a screen, because of his unpresentable costume, when Cave was entertaining an aristocratic guest.
The grotesque and often unpresentable appearance of partial people may provoke discussion.
People had great sympathy with him, for it was known that he had married an unpresentable woman who was an incurable drunkard.
Altogether, he was quite unpresentable, and very lucky to have a father who was a dentist in Monteriano.
I was suddenly seized with a sense of being dingy, travel-stained, unpresentable to a woman so charming.
How, coming unexpectedly on them in their Arcadia, the party found them unpresentable through dirt, and thenceforth unknowable through domestic complications that had filled their Arcadian cabin with half-breed children.
Thirty-year-olds and five-year-olds, solemn and merry, worthy and comic, well-dressed and unpresentable, and even quite naked, long haired, and hairless, all were I and all were seen for a flash, recognized and gone.
Each new self-portrait is yet another stylization of fetishized femininity, one more prosthetic proxy for an unpresentable self.
She was a nice little thing, very shy and timid, but by no means unpresentable, and an evident lady.
I had of course put on my coat, but having no means of ablution at hand, I must have presented a very unpresentable appearance when I entered.